The Redrock Company uses flexible budgeting for cost control. Redrock produced 10,800 units of product during October, incurring indirect material costs of $13,000. Its master budget for the reflected indirect material costs of $180,000 at a production volume of 144,000 units. What was the flexible budget variance for the indirect material costs in October?

Group of answer choices

$1,100 favorable.

$500 favorable.

$2,000 favorable.

$2,000 unfavorable.