What does typical-use failure rate mean, and which two common contraception methods have representative rates?

What does typical-use failure rate mean, and which two common contraception methods have representative rates?

• A. Typical-use failure reflects pregnancy prevention under ideal, perfect-use conditions.
• B. Typical-use failure reflects pregnancy prevention under real-world use.
• C. Perfect-use failure rate is the same as typical-use for all methods.
• D. Typical-use failure rates are zero for condoms.

Answer: (B)