What training must the Contractor provide to City personnel?

The Contractor is required to provide training upon request at prevailing rates because this ensures that City personnel can access required training as needed, rather than having fixed scheduled sessions. This flexibility allows for training to be customized and provided based on specific needs, which can vary among personnel. By charging prevailing rates, it also maintains fairness in compensation for the contractor’s services while aligning with the resource requirements for City personnel's ongoing development and skill enhancement.

Other options may refer to specific types of training (mandatory sessions, emergency preparedness, or certification exam preparation), but they do not capture the essential flexibility and variable nature of training requirements as embodied in the correct answer, which aligns better with the principles of responsive and adaptable training support.