In the implement phase, what is the possible customer benefit of implementation support (Day 1)?

A.
assures customer of a fully operational system and that there is support, if needed.

B.
increases revenue or lowers operating costs or does both by helping to ensure that the implemented system is working to the measures defined in the system acceptance test plan

C.
provides documentation needed to understand the details of network that will be useful when planning for future changes to the system