Final answer:
Probationary firefighters are identified in the EBF-4 by adding (PF) as a suffix after their name.
Step-by-step explanation:
The EBF-4, which pertains to the procedures within a fire department, identifies probationary firefighters by using (PF) as a suffix after their name. This designation helps to distinguish between experienced firefighters and those who are still undergoing probationary periods and training within the fire department. The correct answer to the question is: B. (PF) as a suffix after their name.