Question

When using a computer, you should not keep your:

shoulders and upper arms in line with your torso
wrists and hands straight (not bent up, down, or sideways)
O feet flat on the floor or supported by a stable footrest
O thighs perpendicular to the floor and the lower legs parallel to the floor

Answer 1

Your thighs should not be perpendicular and lower legs not parallel because you have either broke your knee caps backwards or your kneeling

Answer 2

thighs perpendicular to the floor