Which of the following is a practice applied to confirm the integrity of a copy made of a data source?

Hashing is a cryptographic technique that produces a fixed-size string of characters from data input, which uniquely represents the data. When creating a copy of a data source, hashing can be applied both to the original data and to the copied data. By comparing the hash values generated from both sets of data, you can confirm that they are identical, thus verifying the integrity of the copy.

If the hash values match, it indicates that the data has not been altered or corrupted during the copying process. This is crucial for maintaining data integrity, especially in situations where data accuracy is critical, such as in security or compliance contexts. Other practices, like encryption, are primarily focused on securing the data itself rather than confirming its integrity, while redaction involves removing sensitive information, and compression reduces file size but does not address integrity verification.