(a) The validity of the purported custodian’s designation;
(b) The propriety of, or the authority under this chapter for, any act of the purported custodian;
(c) The validity or propriety under this chapter of any instrument or instructions executed or given either by the person purporting to make a transfer or by the purported custodian; or
(d) The propriety of the application of any property of the minor delivered to the purported custodian.