A client who delivered vaginally 2 days ago states that she wants to resume using her diaphragm for birth control. What information should the nurse share with her?

The diaphragm should be inserted 2 to 4 hours before intercourse.

The most effective form of contraception is a diaphragm.

Vaseline lubricant can be used when inserting the diaphragm.

The diaphragm must be refitted after childbirth.