In the question, a sentence has been given in an active/passive voice. Out of the given four alternatives, suggest the one which best expresses the given sentence in passive/active voice.
John has placed an order for a piano.
1
An order for a piano has been placed by John.
2
A piano is being ordered by John.
3
An order for a piano had been placed by John.
4
John was placing the order for a piano.