Why is it important to define Key Performance Indicators (KPIs) for processes in the solution design phase?

A.
KPIs track project success and if the promised value is delivered.

B.
KPIs take a long time to implement in a GUI so they must be defined early in the project.

C.
KPIs document the solution performance and indicate whether hardware needs to be upgraded.

D.
KPIs definitions are mandatory fields during product installation and without them the installation cannot
progress.