The area of the core of a column of cross sectional area A, is

• A. <img src="/_files/images/civil-engineering/theory-of-structures/93-21-140-1.png">
• B. <img src="/_files/images/civil-engineering/theory-of-structures/93-21-140-2.png">
• C. <img src="/_files/images/civil-engineering/theory-of-structures/93-21-140-3.png">
• D. <img src="/_files/images/civil-engineering/theory-of-structures/93-21-140-4.png">