Gulf Corp. makes a special type of answering machine. Each answering machine takes 7 ounces of a special material that costs $6 per ounce. Gulf Corp. bought 2,064 ounces of material at a cost of $12,144. They used 1,844 ounces to make 252 answering machines. a) Compute the direct materials nrice variance and determine whether it is favorable or unfavorable. (Select one) b) Compute the direct materials quantity variance and determine whether it is favorable or unfavorable. c) Compute the total direct materials cost variance and determine whether it is favorable or unfavorable (Select one)