Fill in the blank (_) in the following sentence from the following choices.
Sentence: The lab tech poured the urine from the sample cup into the testing device until the _ was full.

Choice 1: The lab tech poured the urine from the sample cup into the testing device until the sample cup was full.
Choice 2: The lab tech poured the urine from the sample cup into the testing device until the testing device was full.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
2. The lab tech poured the urine from the sample cup into the testing device until the testing device was full.