# Let $[\varepsilon_0]$ denote the dimensional formula of the permittivity of vaccum. If M = mass, L = length, T = time and A = electric current, then :
( A ) $[\varepsilon_0] = [ M^{-1} L^{2} T^{-1} A^{-2}]$
( B ) $[\varepsilon_0] = [ M^{-1} L^{2} T^{-1} A]$
( C ) $[\varepsilon_0] = [ M^{-1} L^{-3} T^{2} A]$
( D ) $[\varepsilon_0] = [ M^{-1} L^{-3} T^4 A^2]$