While Observing a Student Perform a Sterile Procedure, an Instructor

While observing a student perform a sterile procedure, an instructor should immediately intervene if

A) The student turns his or her back to the sterile field to discard coverings.
B) The student drops items into the trash can to discard them.
C) The student opens the first flap of the sterile pack away from his or her body.
D) The student keeps his or her sterile, gloved hands below eye level.