The data sets Ensemble.Spring and Ensemble.Summer both contain a variable named Blue. How do you prevent the values of the variable Blue from being overwritten when you merge the two data sets?a. data ensemble.merged;merge ensemble.spring(rename=(blue=navy)) ensemble.summer;by fabric;run;b. data ensemble.merged;merge ensemble.spring(out=blue) ensemble.summer;by fabric;run;c. data ensemble.merged;merge ensemble.spring(blue=navy) ensemble.summer;by fabric;run;d. data ensemble.merged;merge ensemble.spring(in=blue) ensemble.summer;by fabric;run;