3. CLASSES OF OFFICERS OF CUSTOMS. - There shall be the following classes of officers of customs, namely :- (a) Chief Commissioners of Customs;

(b) Commissioners of Customs;

(c) Commissioners of Customs (Appeals);

(cc) Joint Commissioners of Customs;

(d) Deputy Commissioners of Customs;

(e) Assistant Commissioners of Customs; and

(f) such other class of officers of customs as may be appointed for the purposes of this Act.