When should the architect begin the analysis?

Right after the end user and the customer finalize the negotiations.

Explanation:

The architect's analysis is extremely important to ensure that a system acts correctly and efficiently. This analysis is carried out together with the implementation of codes and security systems, which will be responsible for the defense of the system. This analysis should begin immediately after the end user and the customer have completed negotiations that define all the requirements and information necessary to start the project.

answer; (a) brake pedal is depressed;

because you most likely sighned up