Final answer:
To complete the purchase, Hardy needs to fulfill the terms agreed upon in the option contract, which may include providing the purchase price and signing necessary documents.
Step-by-step explanation:
Hardy, the broker, received a listing from Watson to sell Watson's commercial property, along with an option to purchase it within 30 days. After 27 days, Hardy decided to exercise his option and buy the property. To complete the purchase, Hardy needs to fulfill the terms agreed upon in the option contract, which may include providing the agreed-upon purchase price and signing any necessary documents.