What is the correct definition of a cybersecurity exploit?

The act of executing malicious activity on a system, such as in$-$

fecting it with a virus, installing spyware, or taking it hostage.

A tool or technique for taking advantage of a cybersecurity vul$-$

nerability to break into a system and cause harm.

A hacker or intruder who exploits a flaw in system security to re$-$

motely access and threaten the security of a network.

A weakness or flaw in system security procedures, design, imple$-$

mentation, or control that compromises the safety of the system.