Looks like you have posted the same question twice. So, I will answer it once only.
Answer:
A threat is a person or an organization that seeks to obtain or alter data or other IS assets illegally, without the owner's permission and often without the owner's knowledge.
Explanation:
Threat is the correct option for filling the blank because in computer security, a threat is someone who intercepts your information, steals it or changes it without you knowing. Hence, the right option here is threat.
