Two thin, long, parallel wires, separated by a distance $d$ carry $a$ current of $i$ $A$ in the same direction. They will :

Question

( A ) attract each other with a force of $\frac{\mu_0 i^2}{(2 \pi d^2)}$
( B ) repel each other with a force of $\frac{\mu_0 i^2}{(2 \pi d)}$
( C ) attract each other with a force of $\frac{\mu_0 i^2}{(2 \pi d)}$
( D ) repel each other with a force of $\frac{\mu_0 i^2}{(2 \pi d^2)}$