What clutch technique is generally recommended when moving off from a standstill in a heavy vehicle carrying a load?

1. Release the clutch as quickly as possible for a fast start
2. Release the clutch smoothly and progressively while gently applying power, avoiding harsh engagement that could stall the engine or jolt the load
3. Keep the clutch pedal fully depressed while accelerating hard
4. Never use the clutch when moving off; always use only the brake