Planning

A: Governing principle: Certification is to the regulations in effect at the time of approval unless the contract explicitly locks a revision. Applied here, a silent contract doesn't override regulatory enforcement, so the current standard governs compliance planning. Option B traps engineers who know contracts matter, but miss that certification isn't a commercial negotiation.

A: Governing principle: Field verification follows a safe energization sequence to prevent unintended movement. Here, planning demands cold checks before power reaches actuators, even under time pressure. Option B catches engineers used to functional testing who skip the isolation step.

A: Governing principle: Material selection is driven by fracture toughness at MDMT, not just corrosion or pressure. In this case, impact-tested carbon steel satisfies the temperature duty without unnecessary material changes. Option B tempts planners who generalize low temperature equals stainless.

A: Governing principle: Mechanical seal life depends on immediate lubrication and cooling. The absence of vibration and thermal alarms points to startup conditions rather than steady-state issues. Option C misleads engineers who associate cavitation with seal damage but ignore missing hydraulic symptoms.