What are the provisions under which a person can be detained according to the given text?
According to the given text, a person can be detained in accordance with the provisions of any law made by Parliament under sub-clauses (a) and (b) of clause (7). This includes:

(a) Circumstances under which, and class or classes of cases in which, a person may be detained for a period longer than three months under any law providing for preventive detention without obtaining the opinion of an Advisory Board.

(b) The maximum period for which any person may be detained under any law providing for preventive detention.