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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?

data ensemble.merged;
    merge ensemble.spring(blue=navy) ensemble.summer;
by fabric;
run;

data ensemble.merged;
    merge ensemble.spring(in=blue) ensemble.summer;
    by fabric;
run;

data ensemble.merged;
    merge ensemble.spring(rename=(blue=navy)) ensemble.summer;
    by fabric;
run;

data ensemble.merged;
    merge ensemble.spring(out=blue) ensemble.summer;
    by fabric;
run;