The following instruments are exempt from duty—
(a) an instrument that establishes, or that amends provisions governing, a fund or trust that—
(i) at the time of the instrument is; or
(ii) within 12 months after the instrument takes effect, in the opinion of the trustees, will be—
a complying superannuation fund, a complying approved deposit fund, a pooled superannuation trust or an eligible rollover fund;
(b) an instrument under which an employer agrees to participate in or contribute to a fund that—
(i) at the time the employer agrees to participate or contribute is; or
(ii) within 12 months after that time, in the opinion of the trustees, will be—
a complying superannuation fund;
(c) an instrument that is executed in order to set out or vary the terms of custodial arrangements concerning a fund or trust that—
(i) at the time of the instrument is; or
(ii) within 12 months after the instrument takes effect, in the opinion of the trustees, will be—
a complying superannuation fund, a complying approved deposit fund, a pooled superannuation trust or an eligible rollover fund (whether or not the instrument contains any other terms).