Which of the Following Is Required by Federal Law in Regard

Which of the following is required by federal law in regard to holidays?

A) That employees be allowed to either be off or be paid double for 1 holiday per year.
B) That employees be allowed to either be off or be paid double for 2 holidays per year.
C) That employees be allowed to either be off or be paid double for 3 holidays per year.
D) That employees be allowed to either be off or be paid double for 4 holidays per year.
E) Employees are not guaranteed any holidays off or any extra pay for working holidays under federal law.