For a Type K license, what must an individual have held for at least six months?

To qualify for a Type K license, an individual must have held a B license for at least six months to service fixed extinguisher systems. The B license represents a level of knowledge and skill relevant to fire protection systems, particularly those that are non-automatic and portable, which is foundational for understanding the more complex systems covered under a Type K license.

The B license serves as a prerequisite because the Type K designation specifically pertains to the servicing of kitchen fire suppression systems that use wet chemical agents. Having the foundational knowledge and experience gained from holding a B license ensures that individuals are equipped to safely and effectively manage the unique challenges and regulations associated with commercial cooking hazards. This structured approach to licensing helps maintain safety standards in fire protection, especially in environments where cooking equipment presents higher risks.

The other options do not provide the necessary experience or expertise related to fire suppression for cooking applications, making them insufficient as prerequisites for the Type K license.