Crispy Company manufactures smoke detectors and has developed the following flexible budget for its overhead costs. Manufacturing overhead at Crispy is applied to production on the basis of standard direct labor-hours: Direct labor-hours............ 56,000 40,000 50,000 70,000 84,000 60,000 Detectors produced. Variable overhead cost..... $252,000 $315,000 $378,000 Fixed overhead cost.......... $672,000 $672,000 $672,000 Crispy was expecting to produce 40,000 detectors last year. The actual results for the year were as follows: Number of detectors produced...... Direct labor-hours incurred..... Variable overhead cost 43,200 62,640 $278,748 $714,000 Fixed overhead cost.......... What was Crispy's fixed overhead budget variance? Select one: O a. $11,760 favorable O b. $37,680 favorable O c. $42,000 unfavorable O d. $53,760 favorable