If the moment of inertia of a section about its axis is I and its effective sectional area is A, its radius of gyration r about the axis, is

• A. <img src="/_files/images/civil-engineering/steel-structure-design/96-14-54-1.png">
• B. <img src="/_files/images/civil-engineering/steel-structure-design/96-14-54-2.png">
• C. <img src="/_files/images/civil-engineering/steel-structure-design/96-14-54-3.png">
• D. <img src="/_files/images/civil-engineering/steel-structure-design/96-14-54-4.png">
• E. <img src="/_files/images/civil-engineering/steel-structure-design/96-14-54-5.png">