A context window contains obsolete debug dumps, duplicate retrieval excerpts, a verified customer restriction, and an unresolved approval request. What should be removed first?

1. Every source reference while retaining all repeated diagnostics.
2. The unresolved approval request because it has not yet been answered.
3. Redundant or obsolete diagnostics and duplicate excerpts, preserving the restriction and pending approval.
4. The verified customer restriction because it appeared early in the conversation.