Stack counting is a threat-hunting technique that involves monitoring a specific event or activity, counting the number of times it occurs, and then aggregating those results over time. This technique is useful for identifying patterns of behavior that may indicate a threat actor is active in the environment.

Header analysis is the technique of examining the metadata of an email, such as the sender, recipient, date, subject, and routing information. It can help to identify the source of a malicious email by revealing the IP address and domain name of the originator, as well as any spoofing or redirection attempts. References:
CompTIA CySA+ Study Guide: Exam CS0-003, 3rd Edition, Chapter 6, page 240; CompTIA CySA+ CS0-003 Certification Study Guide, Chapter 6, page 249.

Explanation
The first step that should be performed when establishing a disaster recovery plan is to agree on the goals and objectives of the plan. The goals and objectives of the plan should define what the plan aims to achieve, such as minimizing downtime, restoring critical functions, ensuring data integrity, or meeting compliance requirements. The goals and objectives of the plan should also be aligned with the business needs and priorities of the organization and be measurable and achievable.

Explanation
Increasing training and awareness for all staff is the best way to address the issue of employees being enticed to assist attackers by visiting specific websites and running downloaded files when prompted by phone calls.
This issue is an example of social engineering, which is a technique that exploits human psychology and behavior to manipulate people into performing actions or divulging information that benefit the attackers.
Social engineering can take many forms, such as phishing, vishing, baiting, quid pro quo, or impersonation.
The best defense against social engineering is to educate and train the staff on how to recognize and avoid common social engineering tactics, such as:
Verifying the identity and legitimacy of the caller or sender before following their instructions or clicking on any links or attachments Being wary of unsolicited or unexpected requests for information or action, especially if they involve urgency, pressure, or threats Reporting any suspicious or anomalous activity to the security team or the appropriate authority Following the organization's policies and procedures on security awareness and best practices Official References:
https://partners.comptia.org/docs/default-source/resources/comptia-cysa-cs0-002-exam-objectives
https://www.comptia.org/certifications/cybersecurity-analyst
https://www.comptia.org/blog/the-new-comptia-cybersecurity-analyst-your-questions-answered