The threat model implied by Greg to reduce the DDoS attack by buying mitigation service reduces the impact. Thus, option C is correct.
DDoS attack has been an acronym to distributed denial-of-service attack. It is a type of cybercrime that forms the development of the internet traffic over a server, and the overloading forms the user to be enable to access the site operations.
The mitigation service enables the legitimate traffic to reach the server with forming the filter to the server traffic. The buying of service by Greg reduces the impact of the attack. Thus, option C is correct.
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Your question seems to be incomplete, the missing options to the question are:
A. Likelihood
B. Total attack surface
C. Impact
D. Adversary capability