The dimension of $(\mu_o \epsilon_o)^{-1/2}$ are :

Question

( A ) $[L^{-1} T]$
( B ) $[LT^{-1}]$
( C ) $[L^{-1/2} T^{1/2}]$
( D ) $[L^{1/2} T^{-1/2}]$