Two particles start together from a point O and slide down straight on smooth wires inclined at 30o and 60o to the vertical and in the same vertical plane and on the same side of vertical through O. The relative acceleration of the second with respect to first will be in magnitude and direction as
(a) g/2 in the vertical direction
(b) g√3/2 inclined at 45o to vertical
(c) g/√3 inclined at 60o to vertical
(d) g in the vertical direction