A nurse is caring for a client who is considering several methods of contraception. Which of the following methods of contraception should the nurse identify as being most reliable?

A. An intrauterine device (IUD): IUDs (both levonorgestrel and copper types) are long-acting reversible contraceptives with very high effectiveness and low user-dependence, making them among the most reliable methods. B. A diaphragm with spermicide: A diaphragm with spermicide is less reliable than long-acting methods because effectiveness depends on correct use and timing. C. An oral contraceptive: Oral contraceptives are highly effective with perfect use but are more user-dependent (daily dosing) so typical-use failure rates are higher than IUDs. D. A male condom: Male condoms provide important protection (including STI prevention) but are more prone to user error and have higher typical-use failure rates than IUDs.