What is the correct IUPAC name of the given compound ?
img alt=src="" style="height:103px; width:183px
(A) 2,2-Dimethylbutanoic acid
(B) 2-Carboxyl-2-methylbutane
(C) 2-Ethyl-2-methylpropanoic acid
(D) 3-Methylbutane carboxylic acid

Assertion (A) : Au and Ag are extracted by leaching their ores with a dil. solution of NaCN.
Reason (R) : Impurities associated with these ores dissolve in NaCN.
(i) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
(ii) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
(iii) Assertion (A) is correct, but Reason (R) is incorrect statement.
(iv) Assertion (A) is incorrect, but Reason (R) is correct statement.

Assertion (A) : F – F bond in F₂ molecule is weak.
Reason (R) : F atom is small in size.
(i) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
(ii) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
(iii) Assertion (A) is correct, but Reason (R) is incorrect statement.
(iv) Assertion (A) is incorrect, but Reason (R) is correct statement.

Assertion (A) : Linkage isomerism arises in coordination compounds because of ambidentate ligand.
Reason (R) : Ambidentate ligand like NO₂ has two different donor atoms i.e., N and O.
(i) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
(ii) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
(iii) Assertion (A) is correct, but Reason (R) is incorrect statement.
(iv) Assertion (A) is incorrect, but Reason (R) is correct statement.