The equation of state of a gas is given by(P +aT2/V)Vc = (RT +b) , where a, b, c and R are constants. The isotherms can be represented by P = AVm - BVn , where A and B depend only on temperature then
(a) m = -c and n = -1
(b) m = c and n = 1
(c) m = -c and n = 1
(d) m = c and n = -1