A customer's issue has been successfully resolved. According to best practices for ensuring long-term satisfaction, what is the most critical final step in the problem resolution process?
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A
Documenting the complaint and solution in a centralized system for trend analysis.
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B
Sending the customer a satisfaction survey immediately after the interaction.
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C
Informing the customer that their case is now officially closed.
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D
Following up with the customer a few days later to ensure the solution is still working and they remain satisfied.