Every year, from May to October, a ski resort closes to undertake a project to inspect the surrounding mountain trails and repair the ski lifts before reopening. The date is now 15 September. The project manager wants to know how much more money to allocate to the project budget to meet the completion date of 31 October. Which method or metric should the project manager use? Question 10 options: Estimate at completion (EAC) Parabolic estimation Estimate to complete (ETC) Cost performance index (CPI)