9. It shall be the duty of the guardian ad litem to investigate as fully as possible all circumstances relevant to the proposed adoption with a view to safeguarding the interests of the infant before the Court, and to make a report to the Court for that purpose; and in particular it shall be his duty-
(a) to make inquiries as to all matters alleged in the application, and as to the additional matters specified in Appendix Β to these Rules, and to report to the Court upon them;
(b) to interview (either by himself or by an agent appointed by him for the purpose) every individual being an applicant for the order, or mentioned in the originating application as a person to whom reference may be made, or a person on whom notice of the application is required to be served under Rule 14;
(c) to satisfy himself, within twenty-one days of the service of the originating application on him, whether the infant is, or is not, of an age to understand the effect of an adoption order, and, if he is satisfied that he is,-
(i) to notify the Court forthwith that the infant is in his opinion of such an age;
(ii) to find out whether the infant has been informed of the application and of the said effect, and, if he has not been so informed, to inform him thereof;
(d) to attend the Court whenever required for the purposes of the application.