Final answer:
Option 4. Ladders are the acceptable means of egress from a trench, providing a safe and stable exit method, unlike excavators, shovels, or bulldozers.
Step-by-step explanation:
The acceptable means of egress from a trench is through the use of ladders. Ladders provide a safe and stable method for workers to enter and exit trenches. Excavators, shovels, and bulldozers are not appropriate means of egress for workers in trenches as they are not designed for this purpose and do not provide the necessary stability or safety features required for egress.
The acceptable means of egress from a trench would be ladders, as they provide a safe and efficient way for workers to enter and exit the trench. Excavators, shovels, and bulldozers are not acceptable means of egress, as they are not designed for personnel to safely enter or exit a trench.