Two plates each having an area A are kept parallel to each other at a short distance `d`. They carry charges `+Q and -Q` respectively. The electric field in the space between the plates will be
Options:
(a) `Q'/'epsilon_0A`
(b) `epsilon_0A'/'Q.d`
(c) `epsilon_0Q'/'A.d`
(d) `Q'/'2epsilon_0A`