Regulations prescribing a period for the purpose of paragraph 129(1)(c) may prescribe different periods and specify when a particular period is to apply, which, without limiting the generality of the power, may be to:
(a) visas of a specified class; or
(b) former visa holders in specified circumstances; or
(c) former visa holders in a specified class of persons (which may be former visa holders in a specified place); or
(d) former visa holders in a specified class of persons (which may be former visa holders in a specified place) in specified circumstances.