A city is custodian of a trust established by a donor to pay for the college education of the children of deceased police officers. Both the trust principal and earnings may be used to pay college education costs. The activity meets the definition of a fiduciary activity. Which fund should be used to account for trust activities that are not required to be reported in a Pension Trust Fund or Investment Trust Fund? Select one: a. Permanent Fund b. Private-Purpose Trust Fund C. General Fund O d. Custodial Fund