Which of the following is a necessary step for an organization to take after an attack?

Investigating after an attack is crucial for an organization as it enables a thorough assessment of what occurred, how the breach happened, and the extent of the damage. This step helps in understanding vulnerabilities that may have been exploited and identifies any weaknesses in the security infrastructure. The information gathered during the investigation is essential for developing an effective response strategy, enhancing security measures, improving future incident response plans, and ensuring compliance with legal and regulatory requirements.

Conducting an investigation can also involve logging details of the incident, interviewing involved staff, and reviewing system logs, which all contribute to a comprehensive understanding of the event. This proactive approach not only aids recovery efforts but also plays a vital role in preventing future incidents by informing the organization about necessary improvements or changes in policies and practices.