A project manager leading a hybrid project notices that two senior engineers are constantly arguing about the architectural approach for the new module. The arguments are technical but have become personal, affecting team morale. The project is in a critical phase with a tight deadline. What should the project manager do FIRST?

Separate the two engineers and assign them to different modules to stop the conflict immediately.

Facilitate a meeting with both engineers to identify the root cause of their disagreement and guide them toward a consensus.

Decide on the architectural approach yourself based on the project requirements to ensure the deadline is met.

Report the behavioral issue to their functional managers for disciplinary action.