Match List I and List 2, (the basis of matching being complex formation in qualitative or quantitative analysis of ions) and select the correct answer using the codes given below the lists.

List 1  Ions involved		List 2 Complexing agent
A)	${\mathrm{Ni}}^{2+}$	1)	EDTA
B)	${\mathrm{Zn}}^{2+}$	2)	Sodium nitroprusside
C)	${\mathrm{Cu}}^{2+}$	3)	Ammonia
D)	${\mathrm{S}}^{2-}$	4)	Dimethylglyoxime

Codes :

• A

  A	B	C	D
  1	2	4	3

• B

  4

  1

  3

  2

• C

  3

  4

  2

  1

• D

  4

  3

  1

  2