Please help! Systems Design & Implementation HW

Assume that you are working on an online car rental system (similar to enterprise.com). You have collected the requirements for the system and now you are working on documenting those requirements.

Specify three examples of nonfunctional requirements of the system: 1) a security requirement; 2) an availability requirement; and 3) a performance requirement (you may make any assumptions about the scope, functionalities, number of users, performance, etc.). The three requirements should be specific to the online car rental system, and should be verifiable if possible.