Which of the following cannot occur in Texas without proper approval?

In Texas, leasing portable fire extinguishers requires adherence to specific regulations and standards set forth by authorities. This involves ensuring that the extinguishers are properly maintained, inspected, and tested in accordance with applicable fire safety codes and regulations. Such approval is necessary to guarantee that the equipment meets safety and operational standards, provides adequate protection, and is compliant with the law.

The other activities mentioned, such as providing training on fire safety, installing smoke detectors, and serving food in a commercial kitchen, may not be bound by the same strict regulatory approval process at the state level, although they may still be subject to local codes or industry standards. Training programs can often be developed and delivered by qualified individuals or organizations without needing explicit state approval, installations may be completed by contractors who follow general building codes, and food service operations typically follow health department regulations rather than specific fire safety approvals. Thus, leasing portable fire extinguishers stands out as the correct answer requiring formal approval in Texas.