The question focuses on improving software delivery performance by revising the CAB process, which often causes delays due to centralized approvals. DevOps principles emphasize automation, decentralization, and rapid feedback to enhance flow. Analyzing the options:

• A: Replacing the CAB with a senior manager maintains a centralized bottleneck, potentially slowing deployments and not addressing the core issue of manual approvals.
• B: Allowing developers to merge changes autonomously with automated rollbacks reduces approval delays and empowers teams, while rollbacks mitigate risks—aligning with DevOps practices like continuous deployment.
• C: Shifting to peer reviews at code check-in with automated tests decentralizes quality control, enforces standards early, and eliminates CAB overhead, supporting faster iterations.
• D: Batching changes increases risk and delays feedback, contradicting DevOps goals of small, frequent releases for resilience and speed.
• E: Fast feedback via development platforms (e.g., CI/CD pipelines) is crucial for detecting issues early but doesn't directly replace CAB; it's complementary.

Options B and C directly eliminate CAB bottlenecks by decentralizing approvals and embedding quality in the development flow, thus improving delivery performance without compromising safety.