A reference in this Part to a person being transgender or a transgender person is a reference to a person, whether or not the person is a recognised transgender person--
(a) who identifies as a member of the opposite sex by living, or seeking to live, as a member of the opposite sex, or
(b) who has identified as a member of the opposite sex by living as a member of the opposite sex, or
(c) who, being of indeterminate sex, identifies as a member of a particular sex by living as a member of that sex,and includes a reference to the person being thought of as a transgender person, whether the person is, or was, in fact a transgender person.