Combine the following sentences into one simple sentence.
The servant mopped the room. She found a wallet lying in the corner.
1
The servant found a wallet while mopping the corner of the room.
2
The servant founded a wallet lying in the corner while mopping the room.
3
The servant mopped the room and found a wallet lying in the corner.
4
While mopping the room, the servant found a wallet lying in a corner.