When is it against EPA regulations to use system-dependent recovery equipment? (A) A) When the appliance contains over 15 pounds of refrigerant. (B) B) When the appliance is leaking. (C) When the compressor of the appliance is operational. (D) D) When the ambient temperature is over 105 degrees \( F \).

Using system-dependent recovery equipment is prohibited when the appliance is leaking. Leaks can lead to the release of refrigerants into the atmosphere, which is harmful to the environment and goes against EPA regulations. It's important to fix the leaks first and ensure the appliance is in good working condition before attempting any recovery. Additionally, it's crucial to understand that system-dependent recovery equipment relies on the appliance's own pressure to recover the refrigerant. This means it’s ineffective if the system is compromised, making it necessary to have robust recovery practices in place to maintain compliance and protect the environment.