Two infinitely long parallel conducting plates having surface charge densities +σ and -σ respectively, are separated by a small distance. The medium between the plates is vacuum. If cu is the dielectric permittivity of vacuum, then the electric field in the region between the plates is
(a) 0 volt/meter
(b) σ/2ε0 volt/meter
(c) σ/ε0 volt/meter
(d) 2σ/ε0 volt/meter