While teaching the topic on 'Air', an EVS teacher wanted to demonstrate that air has weight and occupies space. Her colleague suggested the following four different activities for this purpose to her:

a. Place an empty inverted beaker on the surface of the water and start pressing it down

b. Suck the juice through a straw

c. Blow air in a balloon

d. Tie two inflated balloons to a rod and establish equilibrium. Then puncture one of the balloons.

Which of the above activities will lead to demonstrating the desired result?