contestada

Which of the following statements about using condoms to reduce the risk of STIs is TRUE?
1. Condoms treated with the spermicide nonoxynol-9 are more effective than plain latex condoms.
2. Condoms frequently fail, so people should not rely on them to reduce the risk of STIs.
3. It is safe to use condoms that are past their expiration date just so long as they have been stored properly.
4. Latex condoms are effective at preventing the transmission of most STIs.