$57.$ Project management process groups have all of the following characteristics

except:

A$.$ All of the process groups are needed on all projects and all of their interactions

apply to each phase of a project as well as the overall project.

B$.$ The process groups are seldom one$-$time, discrete events; they are overlapping

activities that occur throughout the project.

C$.$ Where a project is divided into phases, the process groups are invoked as

appropriate.

D$.$ The process groups are linked by the outputs they produce