During any period when a trust is deemed to be a charitable trust, a private foundation, or a split-interest trust, the trustee shall not do any of the following:
(a) Engage in any act of self-dealing as defined in Section 4941(d) of the Internal Revenue Code.
(b) Retain any excess business holdings as defined in Section 4943(c) of the Internal Revenue Code.
(c) Make any investments in such manner as to subject the property of the trust to tax under Section 4944 of the Internal Revenue Code.
(d) Make any taxable expenditure as defined in Section 4945(d) of the Internal Revenue Code.