Which of the following Pig Latin expressions is used to sum a set of numbers in a bag?
A. X = FOR EACH C -> (group,SUM(A.a1))
B. X = FOR EACH C GEN [group, SUM (A.a1)];
C. X = FOREACH C GENERATE group, SUM (A.a1);
D. X = FOREACH C GENERATE FLATTEN SUM (A.a1);
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