Identify the criteria required for employees to be covered by the Family and Medical Leave Act $($FMLA$).($More than one option may be correct.$)$

Multiple select question.

They have worked for a government organization in the past.

They have worked for their employer for at least $500$ hours.

They have worked at a location where at least $50$ employees are employed.

They have worked for their employer for at least $12$ months.