(1) Entitlement to leave Subject to section
2613 of this title, an eligible employee shall be entitled to a total of 12 workweeks of leave during any 12-month period for one or more of the following:
(A) Because of the birth of a son or daughter of the employee and in order to care for such son or daughter.
(B) Because of the placement of a son or daughter with the employee for adoption or foster care.
(C) In order to care for the spouse, or a son, daughter, or parent, of the employee, if such spouse, son, daughter, or parent has a serious health condition.
(D) Because of a serious health condition that makes the employee unable to perform the functions of the position of such employee.