means--
a) an ad hoc committee established for a limited term to perform any function of the Authority which is not a function of any permanent committee; and
b) a subcommittee established by -
i) the Authority to perform a function which is not assigned by or under this Act to a permanent committee; and
ii) a permanent or an ad hoc committee to perform any function of that committee.
(If a function of the Authority needs to be performed on a permanent basis by a committee, the Authority may either delegate or assign the function to a permanent committee or establish a new permanent committee to perform the function.)