28.The following information is provided about three materials utilized in the production of a product: Material Standard Mix Standard Unit Price Standard Cost X 1,250 units $3.00 per unit $3,750 Y 750 units 5.00 per unit $3,750 Z 500 units 4.00 per unit $2,000 Yield 2,250 units During May, the following actual production information was provided: Material Actual Mix X 10,000 units Y 5,000 units Z 2,500 units Yield 15,000 units Yield 15,000 units What is the Material yield variance. a.$3,167(U) b.$6,333(F) c.$3,167(F) d.$6,333(U)