Definition: In this task, you're given a statement, and three sentences as choices. Your job is to determine which sentence clearly disagrees with the statement. Indicate your answer as '1', '2', or '3' corresponding to the choice number of the selected sentence.
Input: Statement: Control activities can include both prepayment and postpayment mechanisms to manage improper payments. Choices:  1. Prepayment and postpayment mechanisms do nothing to ensure proper payments. 2. Prepayment and postpayment mechanisms can ensure proper payments. 3. Prepayment and postpayment mechanisms always ensure proper payments.

1