Which of the Following Is True of Project Process Groups

Which of the following is true of project process groups?

A) Closing activities are optional, and planning activities consume the most resources.
B) Defining a project through planning is key, and initiating activities usually take the most time.
C) Initiating activities are often undervalued, while execution activities generally take the most time and resources.
D) Planning activities look at the "best case," while initiating activities focus on "worst case."