Q:

Choose the correct form of Passive Transformation of the sentence given:
 The Vice-Chancellor kept the staff members waiting.

• 1
  The staff members were waiting for the Vice-Chancellor.
• 2
  The staff members are kept waiting for the Vice-Chancellor.
• 3
  The staff members were kept waiting by the Vice-Chancellor.
• 4
  The staff members were being kept waiting by the Vice-Chancellor.