Which of these is NOT part of the Family and Medical Leave Act $($FMLA$)?$

An employer must grant an eligible employee up to a total of $12$ workweeks of unpaid leave in a $12-$month period for qualifying reasons.

It applies to employers having $50$ or more employees during $20$ or more calendar workweeks.

An employer cannot require that the need for medical leave be supported by a certification issued by a health care provider.

Qualifying events include birth of a child, care for an immediate family member with a serious medical condition, or a serious personal health condition.