For how long is an inspection license valid?

An inspection license is valid for a period of 10 years, thus making 4 years the correct choice in the context of other options provided. This duration ensures that certified technicians remain knowledgeable and up-to-date with changing safety regulations and automotive technologies. Regular renewals help maintain high standards in vehicle safety and compliance, thus enhancing public safety on the roads. The other choices do not align with the actual length of validity of an inspection license in North Carolina, reinforcing the need for periodic recertification to ensure that inspectors are well-versed in the latest standards.