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: Therefore, when design engineers are designing the new product, they must identify its key characteristics so that manufacturing engineers can identify and control critical manufacturing processes. Choices:  1. Design engineers have to communicate frequently with manufacturing engineers. 2. Design engineers work on designing new products that manufacturing engineers build. 3. The work that design engineers does not affect manufacturing engineers' work.

3