Solution and Explanation:
Setting a Goal = B
Basis the past data and knowledge, 90 seconds is set as target for maximum time to hold .
Developing a Action Plan = A
The contingent call center workers are hired for anytime service and support to ensure hold time is less than 90 seconds .
Reviewing progress = C
In mid of the project, review is done to check how many times hold time exceeded 90 seconds .
Appraising performance = D
It is done at the end post project completion with data and results .