Final answer:
Alicia and the crew can begin working on the roofing surfaces after it has been determined that they are safe and a method of fall protection has been selected.
Step-by-step explanation:
Alicia and the rest of the crew can begin working on the roofing surfaces after it has been determined that the surface is safe to work on and a method of fall protection has been selected. Alicia's employer must assess the roof first to ensure its strength and structural integrity. If the surface is deemed safe, fall protection measures like safety harness/line or guardrails need to be in place before work can commence.