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: Cost Models Cost models are tools that estimate the effort needed to develop software, based on assumed relationships between the size of a system and the effort needed to design, code, and test the software. Choices:  1. Cost models are only used to estimate the effort of the software testers. 2. Cost models estimate the effort it will take in order to completely make new software. 3. The cost models take into account the amount of hours of downtime a creative personality needs to design.

1