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Two identical current carrying coaxial l...

Two identical current carrying coaxial loops, carry current I in an opposite sense. A simple amperian loop passes through both of them once. Calling the loop as C, then which statement is correct?

A

(a) `int_c vecB.vecdl=pm2mu_0I`

B

(b) the value of `int_c vecB.vecdl` is independent of sense of C.

C

(c) there may be a point on C where `vecB` and `vecdl` are perpendicular.

D

(d) `vec B` vanishes everywhere on C.

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