How many categories of information eligible for exemption from automatic declassification by Executive Order 13526?

Executive Order 13526 outlines 10 categories of information that are eligible for exemption from automatic declassification. These categories include national security, intelligence activities, foreign relations, and more, specifically addressing the need to protect sensitive information that could harm national security or diplomatic relations if disclosed. Each category serves to ensure that critical information remains secure beyond the standard declassification timeline.