Which of the following structures can be seen for the vitreous form of glass?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/01/engineering-materials-metallurgy-questions-answers-silicate-structures-polymorphism-q3a.png"><img alt="The following structures can be seen for the vitreous form of glass - option a" class="alignnone size-full wp-image-200518" height="217" sizes="(max-width: 335px) 100vw, 335px" src="https://www.sanfoundry.com/wp-content/uploads/2018/01/engineering-materials-metallurgy-questions-answers-silicate-structures-polymorphism-q3a.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2018/01/engineering-materials-metallurgy-questions-answers-silicate-structures-polymorphism-q3a.png 335w, https://www.sanfoundry.com/wp-content/uploads/2018/01/engineering-materials-metallurgy-questions-answers-silicate-structures-polymorphism-q3a-300x194.png 300w" width="335"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/01/engineering-materials-metallurgy-questions-answers-silicate-structures-polymorphism-q3b.png"><img alt="The following structures can be seen for the vitreous form of glass - option b" class="alignnone size-full wp-image-200519" height="335" sizes="(max-width: 326px) 100vw, 326px" src="https://www.sanfoundry.com/wp-content/uploads/2018/01/engineering-materials-metallurgy-questions-answers-silicate-structures-polymorphism-q3b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2018/01/engineering-materials-metallurgy-questions-answers-silicate-structures-polymorphism-q3b.png 326w, https://www.sanfoundry.com/wp-content/uploads/2018/01/engineering-materials-metallurgy-questions-answers-silicate-structures-polymorphism-q3b-292x300.png 292w" width="326"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/01/engineering-materials-metallurgy-questions-answers-silicate-structures-polymorphism-q3c.png"><img alt="The following structures can be seen for the vitreous form of glass - option c" class="alignnone size-full wp-image-200520" height="337" sizes="(max-width: 324px) 100vw, 324px" src="https://www.sanfoundry.com/wp-content/uploads/2018/01/engineering-materials-metallurgy-questions-answers-silicate-structures-polymorphism-q3c.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2018/01/engineering-materials-metallurgy-questions-answers-silicate-structures-polymorphism-q3c.png 324w, https://www.sanfoundry.com/wp-content/uploads/2018/01/engineering-materials-metallurgy-questions-answers-silicate-structures-polymorphism-q3c-288x300.png 288w" width="324"/></a>
• D. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/01/engineering-materials-metallurgy-questions-answers-silicate-structures-polymorphism-q3d.png"><img alt="The following structures can be seen for the vitreous form of glass - option d" class="alignnone size-full wp-image-200521" height="232" sizes="(max-width: 232px) 100vw, 232px" src="https://www.sanfoundry.com/wp-content/uploads/2018/01/engineering-materials-metallurgy-questions-answers-silicate-structures-polymorphism-q3d.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2018/01/engineering-materials-metallurgy-questions-answers-silicate-structures-polymorphism-q3d.png 232w, https://www.sanfoundry.com/wp-content/uploads/2018/01/engineering-materials-metallurgy-questions-answers-silicate-structures-polymorphism-q3d-150x150.png 150w" width="232"/></a>