HVAC Contractors License Category 1 allows the installation of a boiler in a residential dwelling __________.

The correct answer indicates that while a Category 1 HVAC contractor's license permits the installation of a boiler in a residential dwelling, it does not cover certain specific tasks such as gas piping and venting.

In this context, gas piping refers to the installation and connection of gas lines that supply fuel to the boiler, while venting pertains to the system that expels combustion gases from the boiler to the outside environment. Both of these tasks require specialized knowledge and qualifications beyond what a Category 1 HVAC contractor can provide.

Thus, the correct choice effectively highlights that while the contractor has the authority to install the boiler itself, they must have additional certifications or licenses to perform the installation of associated systems like gas piping and venting. This underscores the importance of proper licensing and compliance with code requirements in ensuring the safety and efficiency of HVAC systems.