When combining multiple SAS data sets by matching key values, under which conditions would it be more efficient to use multiple SET statements in a Data Step A) Each data set contains a large numbers of rows There are indexes defined for the key(s) being used on both data sets B) Each data set contains a large numbers of rows There are no indexes defined on either data set for the keys being used C)One data set contains a large numbers of rows One data set contains a small number of rows No indexes are defined for the key(s) being used on either data set D) One data set contains a large numbers of rows One data set contains a small number of rows Indexes are defined for the key(s) being used on the large data set
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