What Are Attributes of Oral Contraceptives? (Check All That Apply

What are attributes of oral contraceptives? (Check all that apply.)

A) They contain a progesterone and sometimes an estrogen analogue.
B) The progesterone is in the 21-day pills, and the estrogen is in the 7-day pills.
C) They help protect against ovarian and endometrial cancer.
D) They are appropriate for use by smokers over age 35.
E) They have a low failure rate of only 1 to 5% a year.
F) They act by inhibiting LH and FSH secretion, inhibiting ovulation.