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As an on-call engineer managing a production application, a recent update has significantly increased the application's response time, leading to an incident declaration. All roles except the Planning Lead have been assigned. According to Google's SRE practice, who should assume the Planning Lead role and its responsibilities?
Explanation:
Options A, B, and D are incorrect. The Incident Commander is responsible for taking on any unassigned roles during an incident. Therefore, option C is correct. Any unassigned responsibilities should be handled by the Incident Commander. Reference: Google SRE Book - Managing Incidents (Recursive Separation of Responsibilities)