Match the items of column I and column II
 

	Column - I		Column - II (Overall cell reaction)
A)	Lechlanche cell	p)	$2H_2\left(g\right)+O_2\left(g\right)\to 2H_{2}O\left(l\right)$
B)	Ni-Cd cell	q)	Does not involve any ion in solution and is used in hearing aids
C)	Fuel cell	r)	Rechargeable
D)	Mercury cell	s)	Reaction at cathode $\mathrm{Zn}\left(\mathrm{Hg}\right)+2{\mathrm{OH}}^{-}\to \mathrm{ZnO}+{\mathrm{H}}_2\mathrm{O}+2e^{-}$
		t)	Reaction at anode Zn(s)→Zn2++2e-

Choose the correct answer from the options given below :
 

	(A)	(B)	(C)	(D)
1)	t	r	p	q
2)	q	t	r	s
3)	p	r	q	s
4)	s	t	r