Final answer:
An encrypted file can only be read by someone with the decryption key, making it secure against unauthorized access. The decryption key is essential for converting the file back to a readable state.
Step-by-step explanation:
The statement that is true of an encrypted file is: The file can be read only by a user with the decryption key. When a file is encrypted, it is converted into a secure format that is unreadable without the proper decryption key. Only individuals who possess this key, which is often a password or a specific decryption tool, can revert the encryption to access the file in its original, readable state. Therefore, even the creator or system administrator would not be able to access the file's contents without the decryption key.