Three plates A, B and C are placed close to each other with `+Q` charge given to the middle plate. The inner surfaces to A and C can be connected to earth through plate D and keys `K_(1)` and `K_(2)` . The plates D is a dielectric slab with dielectric constant `K_(1)` then the charge that will flow through plate D and keys `K_(1)` and `K_(2)` . The plate D is a dielectric slab with dielectric constant K, then the charge that will flow though plate D when `K_(2)` is closed and `K_(2)` is open is
A. `-Q`
B. `-Q//2`
C. `Q(1-(1)/(K))`
D. `(Q)/(2)(1-(1)/(K))`
