Name the functional groups highlighted in the molecule shown below.

(i) carboxylic acid; (ii) amide; (iii) sulfide; (iv) amine

(i) carboxylic acid; (ii) amine; (iii) thiol; (iv) amide

(i) ester; (ii) amide; (iii) sulfide; (iv) amine

(i) ester; (ii) amine; (iii) thiol; (iv) amide