The correct answer is A cross functional team with representatives from all required disciplines.

A cross functional team with representatives from all required disciplines works best because it brings together the skills you need at the time of the incident so work can proceed in parallel and with minimal handoffs. A team with representatives from development, operations, security, database, and networking allows decisions to be made quickly and for fixes to be implemented and validated without waiting for other groups to be pulled in.

A cross functional team with representatives from all required disciplines also improves post incident learning and continuous improvement because those who operated the systems and those who built them share context and root cause analysis. This reduces repeated failures and spreads operational knowledge across the organization so recovery becomes faster over time.

Run mainly by the site reliability engineering team is not ideal because relying mostly on one specialty creates a single point of expertise and can slow resolution when domain specific knowledge is needed from other teams. SREs add great process and tooling but they cannot cover every domain alone.

Staffed only by the top software engineers is wrong because top engineers may excel at coding but they may not have the operational, security, or infrastructure expertise needed during complex incidents. Limiting the team to engineers also reduces capacity to coordinate and validate fixes across all systems.

Composed exclusively of senior management is also incorrect because senior managers usually lack the hands on technical knowledge to diagnose and remediate incidents quickly and they can add coordination overhead when technical action is required immediately.

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