Direction: In the following questions, a sentence has been given in Active voice. Out of the four alternatives suggested, select the one which best expresses the same sentence in Passive voice.

Q:

They are painting the walls.

• 1
  The walls are being painted by them.
• 2
  The walls is painted by them.
• 3
  The walls are painting them.
• 4
  The walls are painted by them.