CAR BUYER'S OPTION is a term used to describe the various choices available to someone looking to purchase a car. An ALARM is a security device that can be installed in a car to alert the owner of any potential intrusions. A SEDAN is a type of car with four doors and a typical trunk space. TESTDRIVE is the process of taking a car for a test run before making a purchase, allowing the buyer to get a feel for the car and its features.