Dereck works for long hours on his computer. He frequently experiences physical strain by the end of the day because he does not follow an Important rule of ergonomics with respect to the use of keyboards. Which of the following actions of Dereck could lead to physical strain?
Х
A. placing the keyboard exactly in front of him while typing
B. keeping hands and wrists straight while typing
C. using wrist pads throughout the day
D. pounding at the keys on the keyboard while typing
E. resting his hands on the keyboard when he is not typing