In the Context of the Prevention of HIV or Sexually

In the context of the prevention of HIV or sexually transmitted infection,the goal of researchers working on topical microbicides is to develop a microbicidal gel,cream,film,or suppository that individuals

A) can apply to the vagina prior to intercourse.
B) can apply to the penis following intercourse.
C) can pair with antibiotics.
D) can pair with a powerful vaccine.