Intruder Skill Levels $-$ Journeyman

A$.$ Hackers with minimal technical skill who primarily use existing attack toolkits

B$.$ Hackers with high$-$level technical skills capable of discovering brand new categories of vulnerabilities

C$.$ Some are employed by state$-$sponsored organizations

D$.$ Hackers with sufficient technical skills to modify and extend attack toolkits to use newly discovered, or purchased, vulnerabilities