What should a project manager do to an IT implementation to accurately predict the total cost of the project?

A. List all of the expenses and add them up using best- and worst-case scenarios for each expense.

B. List all of the expenses, including labor, and add them up using an average-case scenario for each expense.

C. Divide the project into phases and assign a dollar amount to each phase.

D. Divide the project into phases and estimate a dollar amount for each milestone within a phase.