Which of the Following Is Appropriate with Respect to Maintaining

Which of the following is appropriate with respect to maintaining a sterile field?

A) A sterile field must not be left unattended.
B) It's acceptable to turn your back to a sterile field as long as you remain in the same room.
C) Talking is allowed across a sterile field, but sneezing, coughing, and reaching across it must be avoided.
D) The base of a sterile field should be slightly moist.