Which tool is most commonly associated with nation state threat actors?

Advanced Persistent Threat (APT)

An advanced persistent threat (APT) is a set of private and perpetual computer hacking methods, often composed by a person targeting a definite entity. An APT ordinarily targets either individual organizations, states or both for marketing or administrative motives. APT methods need a high quality of covertness over a long period of time. This "advanced" system implies advanced methods using malware to employ vulnerabilities in systems.

a) they had recently endured the tyranny of the british king, parliament, and its royal