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Inner Join Question

I am looking at a sample question for the ABAP certification exam. Either I am reading the question incorrectly, or I missed an important concept. I'd appreciate someone to check me here:

What happens when a 1 to many relationship is encountered with an inner join?

A.  Redundant data from the right-hand table is included.
B.  Redundant data from either table is not returned to the result set.
C.  Redundant data from the left-hand table is included.
D.  Runtime error.

I chose C, but the answer key says B. Did I miss an important concept, or is the answer key wrong?

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