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:

All the letters were posted by them.

• 1
  They were posting all the letters.
• 2
  They posted all the letters.
• 3
  They have posted all the letters.
• 4
  They had posted all the letters.