In the TOGAF recommended template for stating an architecture principle (Name, Statement, Rationale, Implications), the Rationale component is the one that "should highlight the business benefits of adhering to the principle... also describe the relationship to other principles, and the intentions regarding a balanced interpretation." That makes A correct. Implications (D) describe the requirements and consequences of carrying out the principle, the Statement (B) succinctly communicates the fundamental rule, and the Name (C) is just the identifying title — none of these addresses inter-principle relationships.
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