What is the primary purpose of the "Need to Know" category?

The primary purpose of the "Need to Know" category is to ensure that access to information is granted based strictly on an individual's job requirements. This principle is a core component of information security practices, particularly in environments dealing with classified or sensitive information. The objective is to limit access to only those individuals who require specific data to perform their duties effectively. This minimizes the risk of unauthorized access and helps maintain the confidentiality and integrity of sensitive information.

In this context, options that suggest access based on clearance, seniority, or authorization to share classified material do not align with the fundamental security principle of restricting access solely to those who need it for their work. This is why the correct choice focuses on eligibility tied directly to job responsibilities rather than other factors.