a. What is the activity variance for revenue? (Indicate the effect of each variance by selecting "F" for favorable, " U " for unfavorable, and "None" for no effect (i.e., zero variance)). b. What is the spending variance for the cost of ingredients? (Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance)). c. What is spending variance for wages and salaries? (Indicate the effect of each variance by selecting " F " for favorable, " U " for unfavorable, and "None" for no effect (i.e., zero variance)). d. What is spending variance for total expenses? (Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance))