The AC plus ETC is known as:

Note: per standard EVM formulas, AC (Actual Cost) plus ETC (Estimate to Complete) equals EAC (Estimate at Completion), which corresponds to option B, not option A. Earned Value (EV) is the budgeted cost of work performed - calculated as percent complete multiplied by BAC - and is unrelated to the AC + ETC formula. The provided answer key appears to contain an error, and the technically correct answer for this formula is Estimate at Completion (B).

Per standard EVM, AC + ETC = EAC = Estimate at Completion, which is actually the correct answer for this formula - the provided answer key appears to have this entry labeled incorrectly.

BAC (Budget at Completion) is the total originally planned budget for the project, a fixed baseline value, not a derived formula combining actual costs and remaining estimates.

VAC (Variance at Completion) is calculated as BAC minus EAC and measures the expected budget overrun or underrun at project completion, not a sum of actual and remaining costs.