Which communication method ensures the security of sensitive information during transmission?

The communication method that ensures the security of sensitive information during transmission is encryption. Encryption is the process of converting information or data into a code, especially to prevent unauthorized access. By doing so, even if the data is intercepted during transmission, it remains unreadable to anyone who does not have the correct decryption key. This makes encryption a critical component in safeguarding sensitive information from potential threats and breaches.

In contrast, the other methods listed do not provide security for data in the same way. Transmission Control Protocol is primarily focused on ensuring reliable and ordered delivery of data packets over a network. Data compression, while useful for reducing file sizes to speed up transmission, does not inherently protect the content during transmission. Signal amplification refers to boosting the strength of signals to enhance communication range or clarity, but again, does not involve any security measures for the data being transmitted.