Req 1A Req 1B Req 2A Req 2B Req 3 Compute the variable overhead rate and efficiency variances. (Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance). Input all amounts as positive values.) Variable overhead rate variance iable overhead efficiency variance Req 2B Req 3X