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A projected volume combines a Secret from another namespace with a ConfigMap from the Pod's own. What is the problem?

  1. A projected volume accepts only one source type
  2. Secrets may not be projected alongside ConfigMaps
  3. Every source must be in the Pod's own namespace
  4. Projected volumes must be mounted read-only
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Answer: C. Every source must be in the Pod's own namespace

All the sources of a projected volume have to live in the same namespace as the Pod that mounts it, so a cross-namespace reference is not possible.

Source: Projected Volumes (Kubernetes) — Introduction

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