In the column-I, a system is described in each option and corresponding time period is given in the column-II. Suitably match them.

	Column – I		Column – II
A)	A simple pendulum of length $\text{'}l\text{'}$ oscillating with small amplitude in a lift moving down with retardation g/2.	P)	$T=2\pi \sqrt{\frac{2\mathcal{l}}{3g}}$
B)	A block attached to an end of a vertical spring, whose other end is fixed to the ceiling of a lift, stretches the spring by length $\text{'}l\text{'}$ in equilibrium. It's time period when lift moves up with an acceleration g/2 is	Q)	$T=2\pi \sqrt{\frac{\mathcal{l}}{g}}$
C)	The time period of small oscillation of a uniform rod of length $\text{'}l\text{'}$ smoothly hinged at one end. The rod oscillates in vertical plane.	R)	$T=2\pi \sqrt{\frac{2\mathcal{l}}{g}}$
D)	A cubical block of edge $\text{'}l\text{'}$ and specific density $\frac{\rho }{2}$ is in equilibrium with some volume inside water filled in a large fixed container. Neglect viscous forces and surface tension. The time period of small  oscillations of the block in vertical direction is	S)	$T=2\pi \sqrt{\frac{\mathcal{l}}{2g}}$