During a lab investigation, students added four 50 g masses to two boxes and arranged the boxes so that they were motionless on a pulley, as shown in the diagram. The students then followed the procedure described in the box. The students recorded their observations after each procedure and reset the pulley system to the original conditions.

During which procedures did students observe an unbalanced upward force on Box 1?

Group of answer choices

Procedures 4 and 5

Procedures 3 and 4

Procedures 1, 2, and 3

Procedures 1, 3, and 5