If revenues are $315,000 under alternative A and $324,000 under Alternative B,and costs are $285,000 for A and $306,000 for B, then using the basic approach in incremental analysis, incremental revenues,costs, and net income, in comparing B to A are respectively. a $9,000,$(21,000), $(12,000). b $(9,000), $21,000, $12,000. c $9,000, $21,000, $12,000 d $(9,000),$21,000,$(12,000)