Fill in the blank (_) in the following sentence from the following choices.
Sentence: Isn't it wiser to buy a reusable filter than a disposable filter? I think the _ is cheaper in the long run.

Choice 1: Isn't it wiser to buy a reusable filter than a disposable filter? I think the reusable filter is cheaper in the long run.
Choice 2: Isn't it wiser to buy a reusable filter than a disposable filter? I think the disposable filter is cheaper in the long run.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.