List common test equipment for aircraft electrical troubleshooting and a key safety note for each.

• A. Multimeter (voltage/current), insulation tester (megger) for insulation resistance, clamp meter (current), signal tracer; safety: power down, PPE, follow procedures
• B. Oscilloscope, soldering iron, spectrum analyzer; safety: never test live circuits
• C. Megohmmeter, hipot tester, thermal camera; safety: only under supervision
• D. Battery tester, LCR meter, megohm bridge; safety: wear gloves

Answer: (A)