I'm confused on the wording here, i know that the budget is compared to actual expenses but i dont know which option expresses that the best.

A flexible budget compares the differences between: Actual performance over several periods. Actual performance and standard costs at the budgeted sales volume. Actual performance and budgeted performance based on actual sales volume. Budgeted performance over several periods. Actual performance and budgeted performance based on budgeted sales volume