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The method that ensures data remains unaltered during transmission focuses primarily on maintaining the integrity of the data. Integrity checks are designed to detect alterations or tampering that may occur during data transmission. By utilizing techniques like checksums, hashes, or error-detecting codes, these checks can verify that the data received is the same as the data that was originally sent.

When data is transmitted over a network, various factors such as interference or malicious attacks can lead to changes in the data. Integrity checks provide a means of validating that the information has not been altered in any way. For instance, if the transmitted data is hashed and a receiver computes the hash to verify against the original, any discrepancy would indicate that the data has been modified.

In contrast, other methods like encryption focus on protecting the content of the data from unauthorized access, rather than ensuring that it remains unchanged. While encryption adds a layer of security by making data unreadable to unauthorized parties, it does not inherently provide a way to confirm the integrity of the data itself. Thus, while encryption is an essential part of data security, it is not specifically aimed at ensuring data has not been altered during transmission.

Access control relates to the permissions and rights assigned to users in a network environment to access