For changing the capacitance of a given parallel plate capacitor, a dielectric material of dielectric constant \(K\) is used, which has the same area as the plates of the capacitor. The thickness of the dielectric slab is \(\frac{3}{4} d\), where \('d'\) is the separation between the plates of parallel plate capacitor. The new capacitance \((C')\) in terms of original capacitance \(\left( C _{0}\right)\) is given by the following relation

1. A \(C ^{\prime}=\frac{3+ K }{4 K } C _{0}\)
2. B \(C ^{\prime}=\frac{4+ K }{3} C _{0}\)
3. C \(C ^{\prime}=\frac{4 K }{ K +3} C _{0}\)
4. D \(C ^{\prime}=\frac{4}{3+ K } C _{0}\)