Alex works at his computer for several hours a day. He is careful to sit up straight at the computer with his feet on the floor and to keep his muscles relaxed, and stays off his computer after 6 p.m. For what kind of computer-related health problems is Alex still at risk?


A. musculoskeletal problems
B. vision problems
C. sleep problems
D. headaches

what is one way to avoid computer related health problems?
 A. always use a track pad instead of a mouse.
B. position your computer so it faces a window.
C. look closely at the screen at all times to maintain your concentration level.
D. take frequent breaks that include moving around and stretching.