Answer: Establish a communication channel where incident responders and leads can communicate with each other.

In the context of Site Reliability Engineering (SRE) incident management, after declaring yourself as the Incident Commander (IC) and assigning roles such as Operations Lead (OL) and Communications Lead (CL), the immediate next step is to establish a communication channel for incident responders and leads. This is crucial for coordinating efforts efficiently and ensuring that all team members are aligned on the incident's status and the steps being taken to resolve it. Option C is the correct answer because it directly addresses the need for effective communication among the incident response team, which is foundational for managing the incident effectively. Options A, B, and D are important steps in the incident management process but come after establishing a communication channel. Mitigating user impact (A) and contacting affected service owners (B) are actions that require coordination through the established communication channel. Starting a postmortem (D) is a step that occurs after the incident has been resolved, not during the initial response phase.

Author: LeetQuiz Editorial Team