How do you spell Elective

Available Definitions:
1)  a. - Exerting the power of choice; selecting; as, an elective act.
2)  a. - Pertaining to, or consisting in, choice, or right of choosing; electoral.
3)  a. - Dependent on choice; bestowed or passing by election; as, an elective study; an elective office.
4)  n. - In an American college, an optional study or course of study.