If the coefficients of r^{th}, (r + 1)^{th} and (r + 2)^{th} terms in the binomial expansion of (1 + y)^{m} are in AP, then m and r satisfy the equation

(a) m^{2} - m(4r - 1) + 4r^{2} + 2 = 0

(b) m^{2} - m(4r + 1) + 4r^{2} - 2 = 0

(c) m^{2} - m(4r + 1) + 4r^{2} + 2 = 0

(d) m^{2} - m(4r - 1) + 4r^{2} - 2 = 0