A beam of rectangular section having simply supported span L, is subject to a concentrated load at its mid-span. What is the length of elasto-plastic zone of the plastic hinge ?

• A. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/16-1243-2.png">
• B. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/16-1243-1.png">
• C. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/25-1300-3.png">
• D. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/25-1300-4.png">