The accelerations of a particle oscillating simple harmonically at distances X1 and X2 from the mean position are a 1 and a2 respectively. Then, the period of oscillation is
(A) 2π√(x1-x2)/(a2-a1)
(B) 2π√(x2-x1)/(a2-a1)
(C) 2π√(a1-a2)/(x1-x2)
(D) none of these