A trench box (shield) is in place in a 12-foot-deep utility trench. Which statement is correct?

1. The box replaces the need for any inspection because shields cannot fail
2. The box is a shielding system that protects workers inside it; it must be installed as designed, and the excavation still needs a competent-person inspection
3. Workers may stand outside the box against an unsupported vertical Type C face because the box is nearby
4. The box allows spoil to be stored at the lip of the trench