Final answer:
The prospectus delivery requirement for an IPO that will be listed continues until the expiration of the cooling-off period.
Step-by-step explanation:
The correct answer is D) Until the expiration of the cooling-off period. The cooling-off period is a regulatory period of time during which the Securities and Exchange Commission (SEC) reviews the IPO prospectus. The prospectus delivery requirement continues until the expiration of this cooling-off period, which typically lasts 20 days. During this time, the prospectus must be provided to potential investors.