Which setting results in each measure produce different results?

The following code is used for EOP headcount and SOP headcount:

If((in([%EMP_JOB_INFO_T.EMPLOYMENT_STATUS%], ‘A’,’U’,’P’) OR

ISNULL([%EMP_JOB_INFO_T.EMPLOYMENT_STATUS%])), [%#CFT#.HEAD_COUNT%], 0).

Which setting results in each measure produce different results?
A . Measure override name
B . Standard measure
C . Data type
D . Aggregation type

Answer: A