The absence of confidentiality terms (D) is the greatest concern because it directly jeopardizes the protection of PII, which is the core issue for a CRM system handling sensitive data. The CISA Review Manual underscores this in Chapter 5, Section 5.3.10: "Contracts with external parties should include provisions for security and privacy, including confidentiality agreements" (Page 392). Without these terms, there’s no contractual assurance of data protection, exposing the organization to legal, regulatory, and reputational risks. While a right-to-audit clause (A) is critical for oversight, its absence is less severe if confidentiality obligations exist, as it’s a means to enforce rather than define protection. SLAs (B) and availability requirements (C) are operational concerns, not directly tied to PII security.