Hashing is an one-way fucntion. Anyone, even the authorized people, can not read the sensitive data.
Encryption can prevent anyone from reading the data. Decryption can let the data become readable for authorized people.
I choose C. Encryption.
Encryption is the process of converting plaintext data into ciphertext using an algorithm and encryption key. It ensures that sensitive data stored at rest (e.g., on hard drives, databases, or storage devices) is rendered unreadable to unauthorized users or attackers. Only those with the appropriate decryption key can transform the ciphertext back into readable plaintext.
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