Which of the Following Are Principles of Sterile Procedure

Which of the following are principles of sterile procedure?

A) Gowns are sterile from the chest and shoulder to table level.
B) Sterile persons must keep hands in view and above the waist and below the neck.
C) Sterile persons must fold arms across chest with hands tucked into the axillary region.
D) Unscrubbed persons must stay at least 6 inches away from the sterile field.
E) Sterile persons may position themselves with their back to the sterile field.