Which chapter in the EKMS 1B addresses PDSs?

The correct answer is B, as Chapter 10 of the EKMS 1B specifically addresses PDSs, or keying material distribution systems. This chapter provides detailed guidance on the creation, management, and operational procedures associated with PDSs, ensuring the secure handling and distribution of keying material is in accordance with established policies. Understanding the content in this chapter is crucial for maintaining secure communications, as it outlines the requirements and responsibilities associated with PDS operation. Thus, familiarity with Chapter 10 is essential for personnel involved in COMSEC operations and who handle key material.