What is required to legally carry a concealed firearm in Hawaii?

In Hawaii, to legally carry a concealed firearm, individuals are required to have a Concealed Carry Permit, provide proof of firearm training, and obtain approval from the local police chief. Therefore, the correct answer is D, "All of the above." These requirements are in place to ensure that individuals who carry concealed firearms are properly trained, vetted, and authorized to enhance public safety and ensure responsible gun ownership.