Question: Which is not a reason why data integration across multiple organizations is harder than integration within an organization? A B C D SQL can be

Which is not a reason why data integration across multiple organizations is harder than integration within an organization?
A
B
C
D
SQL can be implemented differently in different databases, which creates a need to reconcile those differences.
Efficient execution of queries over multiple systems is challenging.
Query processing in distributed databases is challenging.
Data from different sources tend to be structured differently.

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