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A
The internal audit function should serve as the first line of defense and continually validate operational procedures used by the business lines.
B
Business line managers, as part of the first line of defense, should provide a credible challenge to the internal audit function.
C
The corporate operational risk function, as part of the second line of defense, should challenge risk inputs from business line managers.
D
The corporate operational risk function should serve as the third line of defense and validate model assumptions made by senior management.