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Which program will combine Brothers.One and Brothers.Two to produce Brothers.Three?

 

data brothers.three;
    set brothers.one;
    set brothers.two;
run;

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data brothers.three;
    set brothers.one brothers.two;
run;

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data brothers.three;
    set brothers.one brothers.two;
    by varx;
run;

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data brothers.three;
    merge brothers.one brothers.two;
    by varx;
run;

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