正解:C
Transport Layer Security (TLS) is a protocol that provides encryption, authentication, and integrity for data transmitted over the Internet. TLS protects the confidentiality of data by encrypting it before sending it and decrypting it after receiving it. TLS also verifies the identity of the communicating parties by using certificates and prevents data tampering by using message authentication codes. References = CISM Review Manual, 16th Edition, Chapter 4, Section 4.3.2.11