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Comprehensive and Detailed Explanation:

The correct answer is B.

When a fire is discovered, prompt activation of the alarm system and implementation of established emergency procedures are critical. Early notification allows occupants to begin evacuation and enables emergency responders to react quickly. Delays can increase the risk of injury, property damage, and fire spread.

Emergency action plans should clearly define responsibilities, evacuation routes, assembly locations, communication methods, and accountability procedures. Employees should receive training on recognizing alarm signals and responding appropriately.

OHST professionals often participate in emergency planning, training, and drills. They help ensure that employees understand emergency procedures and that systems function effectively during actual emergencies.

While some trained individuals may use portable fire extinguishers under specific circumstances, life safety remains the top priority. Employees should never place themselves at unnecessary risk. Effective emergency preparedness relies on planning, training, communication, and regular practice through drills and exercises.