According to BS standard, which of the following relation is correct about gauge length of cross section area A ?

According to BS standard, which of the following relation is correct a

1.	According to BS standard, which of the following relation is correct about gauge length of cross section area A ?
A.	L = 2.51 ( sqrt{A} )
B.	L = 4.51 ( sqrt{A} )
C.	L = 4 ( sqrt{A} )
D.	L = 3.51 ( sqrt{A} )
Answer» D. L = 3.51 ( sqrt{A} )