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. A male condom: While male condoms provide protection against sexually transmitted infections and pregnancy, their effectiveness is lower due to the potential for breakage, slippage, or inconsistent use, leading to higher failure rates compared to long-acting methods. B. An intrauterine device (IUD): IUDs, both hormonal and copper-based, are among the most effective contraceptive methods, with failure rates less than 1%. They offer long-term protection, require no daily adherence, and are not user-dependent once placed. C. An oral contraceptive: Oral contraceptives are effective when taken consistently and correctly, but their effectiveness decreases with missed doses, medication interactions, or gastrointestinal disturbances like vomiting or diarrhea. D. A diaphragm with spermicide: Diaphragms are moderately effective but rely on proper placement and use with spermicide. They have a higher typical-use failure rate than IUDs and oral contraceptives due to user variability and timing.