Fill in the blank (_) in the following sentence from the following choices.
Sentence: At the meeting, I greeted the woman at the elevator instead of in the office because she didn't know where the _ was.

Choice 1: At the meeting, I greeted the woman at the elevator instead of in the office because she didn't know where the office was.
Choice 2: At the meeting, I greeted the woman at the elevator instead of in the office because she didn't know where the elevator was.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
2.