Which global variables statement is true?

Which global variables statement is true?
A .  A global variable is a synonym for special registers.
B .  Like for special registers, the access to global variables cannot be granted or revoked.
C .  A global variable is a created DB2 object, which can be instantiated and used by applications.
D .  Global variables can only be used in native SQL stored procedures and user-defined functions.

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Answer: B