A Loop carrying current I lies in XY - plane as shown in the figure. The unit vector `hatk` is comming out of the plane of the paper. The magnetic moment of the current Loop is...................
Options:
(a) `I a^ 2hatk`
(b) `(pi/2+1)a^2Ihatk`
(c) `-(pi/2+1)a^2Ihatk`
(d) `2(pi+1)a^2Ihatk`