What are the ways SAP IBP identifies profiles and periods?

Time profiles are made out of levels, which are in turn made out of periods .

What are the ways SAP IBP identifies profiles and periods?
A . Periods are identified by an integer and profiles by an alphanumeric prefix.
B . Periods are identified by an alphanumeric prefix and profiles by an integer.
C . Both periods and profiles are identified by an integer.
D . Periods are identified by a start and end date and profiles by an integer.

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Answer: D