Fill in the blank (_) in the following sentence from the following choices.
Sentence: Mark didn't like leaving his dog on a leash outside and preferred the cage because the _ was secure.

Choice 1: Mark didn't like leaving his dog on a leash outside and preferred the cage because the cage was secure.
Choice 2: Mark didn't like leaving his dog on a leash outside and preferred the cage because the leash was secure.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.