Select the correct active/passive form of the given sentence. **All the confidential files had been securely encrypted by the IT department before the system breach.**
Options:
- A: All the confidential files were securely encrypted by the IT department before the system breach.
- B: The IT department had securely encrypted all the confidential files before the system breach.
- C: The IT department securely encrypted all the confidential files before the system breach.
- D: The IT department was securely encrypting all the confidential files before the system breach.
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