Answer:
D. all of the above
Step-by-step explanation:
a. The preparer must make the copy or record of returns and claims for refund and record of the individuals required to sign available for inspection upon request by the commissioner.
b. The preparer must retain a completed copy of each return or claim for refund prepared or retain a record by list, card file, or otherwise, of information, as required by regulation, about each return prepared.
c. The preparer must retain information about the preparer of each return presented to a taxpayer for signature. This information may be retained via retention of a copy of the return or claim for refund, maintenance of a list or card file, or otherwise.