Understanding the nature of the attack provides critical insights into how the compromise occurred, what methods the hacker used, and potentially what their motives and capabilities might be. This information helps in constructing a profile of the incident, which includes details such as the attack vector, techniques employed, and the potential goals of the attacker.
While the other options (A, B, and D) might provide additional context or details relevant to the investigation, they are generally secondary to understanding the specific nature and characteristics of the attack itself.