Comprehensive and Detailed in Depth Explanation:

AC.L2-3.1.13[a] requires the OSC to identify cryptographic mechanisms protecting remote access session confidentiality, per NIST SP 800-171A and CMMC Level 2 guidelines. The organization’s Access Control Policy and Procedures outline the standards and requirements for cryptography (e.g., FIPS-validated modules), while system design documentation details the specific mechanisms implemented (e.g., TLS, VPN configurations). These documents directly address the identification of cryptographic controls, making them the primary specifications for this objective.

Option A and B (interviews) provide supplementary insights but lack the authoritative detail of written policies and designs. Option C (remote access authorizations) focuses on permissions, not cryptographic mechanisms. Option D is the correct answer, as it aligns with NIST SP 800-171A’semphasis on examining specifications for objective [a].

Reference Extract:

NIST SP 800-171A, AC-3.1.13[a]:“Examine access control policy; procedures addressing remote access… system design documentation to determine if cryptographic mechanisms are identified.”

CMMC AG Level 2, AC.L2-3.1.13:“Verify cryptographic mechanisms via policy and design specs.”Resources:https://csrc.nist.gov/pubs/sp/800/171/a/final ;https://dodcio.defense.gov/Portals/0/Documents/CMMC/AG_Level2_MasterV2.0_FINAL_202112016_508.pdf