c-1. What is the variable overhead efficiency variance? (Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance). The amount of the variable overhead efficiency variance c-2. What is the variable overhead rate variance? (Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance)) The amount of the variable overhead rate variance c-1. What is the variable overhead efficiency variance? (Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance). The amount of the variable overhead efficiency variance c-2. What is the variable overhead rate variance? (Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance)) The amount of the variable overhead rate variance