Andrea is setting up some new electrical equipment in her esthetician's room. She wants to make sure to set up the equipment so that she can
comfortably and ergonomically use it for services. The set-up of the equipment should allow Andrea to sit or stand up straight and keep her wrists
and arms in what type of position?
A.in a floppy and bendable position, constantly moving
B.in a rigid position that keeps wrists very straight
C.in a comfortable straight or slightly flexed position
D. in a 90-degree angle at all times