Karen and Andy own a beach house. They have an agreement with a rental agent to rent it up to 200 days per year. For the past three years, the agent has been successful in renting it for 200 days. Karen and Andy use the beach house for one week during the summer and one week during Thanksgiving. Their daughter, Sarah, a college student, has asked if she and some friends can use the beach house for the week of spring break. Advise Karen and Andy how they should respond and identify any relevant tax issues?