21. —The functions of the Commissioner shall be, in addition to any functions conferred on him or her by any other provision of this Act—

(a) to monitor compliance by public bodies with the provisions of this Act,

F38[(aa) to monitor, where he or she considers appropriate, compliance by public bodies with any other enactment relating to the status or use of an official language,]

(b) to take all necessary measures within his or her authority to ensure compliance by public bodies with the provisions of this Act,

(c) to carry out investigations, whether on his or her own initiative, on request by the Minister or pursuant to a complaint made to him or her by any person, into any failure by a public body to comply with the provisions of this Act that he or she or, as appropriate, the Minister, considers may have occurred,

(d) to provide, as he or she considers appropriate, advice or other assistance to the public regarding their rights under this Act,

(e) to provide, as he or she considers appropriate, advice or other assistance to public bodies regarding their obligations under this Act, and

(f) to carry out an investigation, whether on his or her own initiative, on request by the Minister or pursuant to a complaint made to him or her by any person, to ascertain whether any provision of any other enactment relating to the status or use of an official language was not or is not being complied with.