Gravity pulls downward on a rock with a force of 800 N. If you pull upward on the rock with a force of 400 N, what is the total force acting on the rock?
A400 N downward
B400 N upward
C1200 N downward
D1200 N upward
A400 N downward
B400 N upward
C1200 N downward
D1200 N upward