According to the cargo restraint and securement principles in JT/T 617.6, packaged dangerous goods loaded in a commercial vehicle must be blocked, braced, and lashed to withstand which minimum directional accelerations without shifting?

1. 0.8g forward (deceleration/braking), 0.5g lateral (turning), and 0.5g rearward (acceleration)
2. 0.1g forward, 0.05g lateral, and 0.05g rearward
3. 5.0g forward, 5.0g lateral, and 5.0g rearward
4. Zero restraint is required if the rear cargo door is padlocked