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: Requirement or system component must be able to perform. Choices:  1. Requirement and system component are both not necessary. 2. Only one is needed at first, but eventually they both will be needed. 3. Out of requirement and system component, one must be able to work.

1