How is VAC (Variance at Completion) calculated?

The calculation of Variance at Completion (VAC) is determined by the formula: VAC = Budget at Completion (BAC) - Estimated at Completion (EAC). This metric helps project managers understand how much over or under budget the project is likely to be at completion.

In this case, the correct answer clearly reflects this relationship between BAC and EAC, indicating that VAC provides insight into the anticipated financial performance of the project as it reaches its conclusion. It essentially tells stakeholders whether the project is expected to finish within the budgeted amount or exceed it.

This understanding is key in project management, as maintaining budgetary compliance is crucial for project success and stakeholder satisfaction. Other options presented do not effectively represent the calculation of VAC, demonstrating different aspects of project performance metrics that are not directly linked to the concept of variance at completion.