Match the column

Column I		Column II
(P)	${\mathrm{Na}}^{+}\left(aq\right)+{\mathrm{e}}^{-}⟶\mathrm{Na}\left(s\right)$	(1)	Reaction taking place at anode during electrolysis of very dilute solution of NaCl using Pt electrodes.
(Q)	The concentration of CuSO4 solution does not change on electrolysis	(2)	Reaction taking place at anode during electrolysis of CuSO4 using Cu electrode.
(R)	$\mathrm{Cu}\left(\mathrm{s}\right)⟶{\mathrm{Cu}}^{2+}\left(\mathrm{aq}\right)+2{\mathrm{e}}^{-}$	(3)	Electrolysis of aqs CuSO4 using Cu electrodes
(S)	$4{\mathrm{OH}}^{-}⟶2{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2+4{\mathrm{e}}^{-}$	(4)	Reaction taking place at cathode when electrolysis of aq NaCl is done using Hg electrode

• A

  P-4, Q-3, R-2, S-1

• B

  P-4, Q-2, R-3, S- 1

• C

   P-1, Q-2, R-3, S-4

• D

  P-2 Q-3, R-1, S-4