A Special Tool Has Been Designed to Help Remove and Install

A special tool has been designed to help remove and install nozzles from the burner. It is called a nozzle wrench and it ____.

A) has an outer wrench that holds the burner in place, while the inner wrench holds the nozzle
B) minimizes the chance of cracking the porcelain
C) can only be used on semi-hollow cones
D) both a and b