Given below is a sentence that may or may not be grammatically viable, choose the most suitable alternative that reflects the grammatically correct sentence. If the sentence does not require any correction, choose option 5, i.e., "no correction required" as your answer choice.
"The door was opened at the locksmith."
1
The door was opened in the locksmith.
2
The door was opened on the locksmith.
3
The door was opened by the locksmith.
4
The door was opened for the locksmith.
5
The door was opened through the locksmith.