In the circuit shown in figure points a, b and c are maintained at constant (but may be different) potentials. When a resistance is connected between a and b no current flows through it, when the same resistance is connected between b and c current flows from c to b.
If `V_(a) = V_(b) = 10 V` and `V_(c) = 30 V`. Then value of `V_(d)` will be
A. `(165)/(9)V`
B. `(170)/(11)V`
C. `(154)/(8)V`
D. `(185)/(13)V`