Final answer:
NA1 is an area code used in the state of North Carolina.
Step-by-step explanation:
NA1, which stands for North American Numbering Plan Area 1, is an area code that is used in the state of North Carolina.
An area code is a three-digit number that is used to identify a specific geographic region within a country. In the case of NA1, it is used to identify a specific region within North Carolina.