(1) The board of a securities exchange may, by resolution, appoint a management sub-committee of not fewer than 3 nor more than 5 members of the securities exchange, at least one of whom is also a member of the board. (2) The board may, by resolution, delegate to a sub-committee all or any of its powers, authorities and discretions under a provision of this Part (other than this section, section 904, subsection 907(8), (10) or (11) or section 909). (3) A power, authority or discretion delegated under subsection (2) may be exercised by members forming a majority of the sub-committee as if that power, authority or discretion had been conferred by this Part on a majority of the members of the sub-committee. (4) A delegation under this section may at any time, by resolution of the board, be varied or revoked. (5) The board may at any time, by resolution, remove a member of a sub-committee and may, by resolution, fill a vacancy arising in the membership of the sub-committee.