During the execution of a major HVAC renovation project, the primary contractor discovers that a specified air handling unit model has been discontinued by the manufacturer. They propose substituting it with a newer, slightly more expensive model with better energy efficiency. What is the facility manager's most appropriate first step in this situation?
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A
Authorize the contractor to proceed with the substitution to avoid schedule delays.
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B
Reject the substitution because it was not in the original approved plan.
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C
Consult the project's change control board for a decision.
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D
Initiate the formal change control process by documenting and assessing the request.