In order to consider and determine any application under this Ordinance, the Authority may-
(a) receive and consider any material, whether by way of oral evidence, written statements, documents or otherwise, and whether or not it would be admissible in a court of law;
(b) by notice in writing signed by the Chairman of the Authority or, if he is precluded by illness, absence from Hong Kong or any other cause from signing the notice, by the Vice-chairman, require the applicant or any other person having the right to appear at the hearing of the application-
(i) to produce to it any document that is relevant to the application and is in his custody or under his control; or
(ii) to appear before it and to give evidence relevant to the application;
(c) administer oaths and affirmations;
(d) require evidence to be given on oath or affirmation.