A parallel plate capacitor filled with a material of dielectric constant `K` is charged to a certain voltage and is isolated. The dielectric material is removed. Then
(a) The capacitance decreases by a factor `K`
(b) The electric field reduces by a factor `K`
( c) The voltage across the capacitor increases by a factor `K`
(d) The charge stored in the capacitor increases by a factor `K`.