The correct answers are A, B, and D because they align with CCPS guidance on Compliance with Standards , which emphasizes both adherence and thoughtful application of standards.

Option A is correct because standards should be living documents , updated as new knowledge, technology, and lessons learned become available. This ensures continuous improvement and relevance.

Option B is also correct because compliance with codes and standards represents a minimum requirement , not a guarantee of safety. CCPS stresses that organizations must go beyond compliance and apply risk-based decision-making tailored to their specific hazards.

Option D is correct because companies are allowed—and often expected—to develop internal standards that may be more stringent or better suited to their operations than external codes.

Option C is incorrect because while standards should be kept current, there is no requirement to update them specifically before each PHA revalidation.

Option E is incorrect because deviations from standards must be formally justified, evaluated, and approved , not simply allowed due to complexity.

Option F is incorrect because existing equipment is typically governed by the codes in effect at the time of design , unless risk justifies upgrades.

CCPS emphasizes that effective compliance involves understanding, application, and continuous improvement , not just adherence.