In a parallel plate condenser, the radius of each circular plate is \[12cm\] and the distance between the plates is\[5mm\]. There is a glass slab of \[3mm\] thick and of radius \[12cm\] with dielectric constant 6 between its plates. The capacity of the condenser will be

• A.         \[144\times {{10}^{-9}}F\]
• B.         \[40pF\]
• C.         \[160pF\] 
• D.            \[1.44\mu F\]