An admission by a child of an offence is not an admission for the purposes of this Act unless it takes place in the presence of--
(a) a person responsible for the child, or
(b) an adult (other than an investigating official) who is present with the consent of a person responsible for the child, or
(c) if the child is 14 years or over, an adult chosen by the child, or
(d) an Australian legal practitioner chosen by the child.