Which of the following is called wing nut?

• A. <img alt="The conventional representation of hexagonal headed bolt - option a" class="alignnone size-full wp-image-300718" height="111" sizes="(max-width: 363px) 100vw, 363px" src="https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q1d.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q1d.png 363w, https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q1d-300x92.png 300w" width="363"/>
• B. <img alt="The conventional representation of hexagonal headed bolt - option b" class="alignnone size-full wp-image-300730" height="134" src="https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q9b.png" width="279"/>
• C. <img alt="The conventional representation of hexagonal headed bolt - option c" class="alignnone size-full wp-image-300727" height="124" sizes="(max-width: 396px) 100vw, 396px" src="https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q6b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q6b.png 396w, https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q6b-300x94.png 300w" width="396"/>
• D. <img alt="The conventional representation of hexagonal headed bolt - option d" class="alignnone size-full wp-image-300717" height="126" sizes="(max-width: 357px) 100vw, 357px" src="https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q1c.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q1c.png 357w, https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q1c-300x106.png 300w" width="357"/>