Final answer:
The post-termination transition period for an S corporation ends one year after the termination date, allowing certain actions under S corporation status.
Step-by-step explanation:
The post-termination transition period (PTTP) for an S corporation ends one year after the termination date. This means that, in response to the multiple-choice question, the correct answer is (c) One year after the termination date. The PTTP is a timeframe during which a corporation that has terminated its S election may still take certain actions as if it were an S corporation, such as distributing its previously taxed income.