The equivalent length of a simple pendulum which gives the same frequency as compound pendulum is

• A. <img src="/_files/images/mechanical-engineering/engineering-mechanics/46-264-1.png">
• B. <img src="/_files/images/mechanical-engineering/engineering-mechanics/46-264-2.png">
• C. <img src="/_files/images/mechanical-engineering/engineering-mechanics/46-264-3.png">
• D. <img src="/_files/images/mechanical-engineering/engineering-mechanics/46-264-4.png">