[1][There shall be the following Classes of officers of customs, namely: -

(a) Principal Chief Commissioner of Customs or Principal Chief Commissioner of Customs (Preventive) or Principal Director General of Revenue Intelligence;

(b) Chief Commissioner of Customs or Chief Commissioner of Customs (Preventive) or Director General of Revenue Intelligence;

(c) Principal Commissioner of Customs or Principal Commissioner of Customs (Preventive) or Principal Additional Director General of Revenue Intelligence or Principal Commissioner of Customs (Audit);

(d) Commissioner of Customs or Commissioner of Customs (Preventive) or Additional Director General of Revenue Intelligence or Commissioner of Customs (Audit);

(e) Principal Commissioner of Customs (Appeals);

(f) Commissioner of Customs (Appeals);

(g) Additional Commissioner of Customs or Additional Commissioner of Customs (Preventive) or Additional Director of Revenue Intelligence or Additional Commissioner of Customs (Audit);

(h) Joint Commissioner of Customs or Joint Commissioner of Customs (Preventive) or Joint Director of Revenue Intelligence or Joint Commissioner of Customs (Audit);

(i) Deputy Commissioner of Customs or Deputy Commissioner of Customs (Preventive) or Deputy Director of Revenue Intelligence or Deputy Commissioner of Customs (Audit);

(j) Assistant Commissioner of Customs or Assistant Commissioner of Customs (Preventive) or Assistant Director of Revenue Intelligence or Assistant Commissioner of Customs (Audit);

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