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For adult sudden cardiac arrest, early high-quality CPR with minimal interruptions and rapid defibrillation are the cornerstone interventions. On finding an unresponsive patient with agonal or absent respirations, start chest compressions immediately (at least 100–120/min, depth 2–2.4 inches, full recoil) while a partner powers on the AED and applies pads as soon as available. This team approach minimizes no-flow time. Option (A) delays circulation; compressions should begin without waiting. Checking long pulses (B) wastes time; pulse checks should be ≤10 seconds, and initial breaths without compressions are inappropriate in adult sudden collapse. Transport without on-scene defibrillation (D) forfeits the chance for early shock in shockable rhythms (VF/VT), which dramatically reduces survival per minute of delay. Once the AED is attached, follow prompts: stop compressions only when advised to analyze; deliver a shock if indicated, then immediately resume compressions for 2 minutes before the next analysis. Coordinate airway/ventilation and medication support without interrupting compressions, and rotate compressors every 2 minutes to maintain quality.