Which of the following curve represents the ideal rigid material?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-element-plasticity-theory-flow-curve-q7a.png"><img alt="The following curve represents the ideal plastic material - option a" class="alignnone size-full wp-image-265433" height="199" src="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-element-plasticity-theory-flow-curve-q7a.png" width="213"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-element-plasticity-theory-flow-curve-q7b.png"><img alt="The following curve represents the ideal plastic material - option b" class="alignnone size-full wp-image-265432" height="194" src="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-element-plasticity-theory-flow-curve-q7b.png" width="215"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-element-plasticity-theory-flow-curve-q7c.png"><img alt="The following curve represents the ideal plastic material - option c" class="alignnone size-full wp-image-265431" height="193" src="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-element-plasticity-theory-flow-curve-q7c.png" width="212"/></a>
• D. <a href="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-element-plasticity-theory-flow-curve-q7d.png"><img alt="The following curve represents the ideal plastic material - option d" class="alignnone size-full wp-image-265430" height="146" src="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-element-plasticity-theory-flow-curve-q7d.png" width="193"/></a>