“(3) The Registrar-General may approve an application made under subsection (1) and enter the applicant's name on the list if the Registrar-General is satisfied that—
“(b) the applicant will conscientiously perform the duties of a marriage celebrant under this Act and under the Births, Deaths, Marriages, and Relationships Registration Act 1995; and
“(c) it is in the interests of the public generally, or of a particular community (whether defined by geography, interest, belief, or some other factor) that the person be a marriage celebrant.”