A. Yes, you can add an IfExists condition at the end of a Null condition but not in all Regions.
B. Yes, you can add an IfExists condition at the end of a Null condition depending on the condition.
C. No, you cannot add an IfExists condition at the end of a Null condition.
D. Yes, you can add an IfExists condition at the end of a Null condition.

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