What is the advantage of using one type of SQL syntax above another?

A report author is considering which SQL syntax to use for accessing various Data sources.
What is the advantage of using one type of SQL syntax above another?
A. Cognos SQL can use non-standard SQL.
B. Cognos SQL works on any supported database.
C. The performance is optimized across all related query subjects with Pass Through SQL.
D. With Pass Through SQL and Native SQL, the SQL may not work on a different database.

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