Completion estimate (EAC) is the overall final value of a schedule activity, the WBS component, or the expected or planned project, when the project is defined. Which of the following information is required in order to compute EAC, assuming no management intervention is required ？（）
A．to the current date of the EV and the actual cost of AC
B．cost performance index CPI and cost variable CV
C．to the current date of the actual cost of AC and the cost performance index CPI
D．the actual cost of AC and ETC to the current date