Which of the following is best defined as a circumstance in which a collection of information items is required to be classified at a higher security level than any of the individual items that comprise it? 

Answer options:

A. Aggregation
B. Inference
C. Clustering
D. Collision

A

The Internet Security Glossary (RFC2828) defines aggregation as a circumstance in which a collection of information items is required to be classified at a higher security level than any of the individual items that comprise it. Source: SHIREY, Robert W., RFC2828: Internet Security Glossary, may 2000.