A nurse is reinforcing education with a client who is sexually active about sexually transmitted infections (STIs). Which of the following statements by the client indicates an understanding of the instruction?

"I can't get an STI, because I only have one partner."

"Sharing sex toys does not increase my risk of getting an STI,"

"I can't get an STI when engaging in oral sex."

"My risk of getting an STI is lower because I always use condoms.”