What must be done, at a minimum, before a system can legally be opened up for repairs while adhering to the prohibition against the venting of halogenated fluoro-carbon refrigerants to the atmosphere?

Correct Answer: Option B — recovery of the refrigerant

EPA Section 608 regulations strictly prohibit venting ozone-depleting halogenated fluorocarbons. Certified recovery equipment must evacuate the system to specific vacuum levels before opening components for maintenance.