Transport Layer Security Protocol (TLS) is a cryptographic protocol that provides end-to-end communication security between two parties over a network, such as the internet. TLS protects the confidentiality, integrity and authenticity of the data exchanged between the parties, such as personal data, by using encryption, hashing and digital signatures. TLS is the best protocol to protect end-to-end communication of personal data, as it prevents unauthorized access, modification or tampering of the data by third parties or intermediaries. The other options are not as effective as TLS in protecting end-to-end communication of personal data. Transmission Control Protocol (TCP) is a network protocol that provides reliable and ordered delivery of data packets between two parties over a network, but it does not provide any security or encryption of the data. Secure File Transfer Protocol (SFTP) is a network protocol that provides secure and encrypted file transfer between two parties over a network, but it does not provide end-to-end communication security for other types of data or messages.Hypertext Transfer Protocol (HTTP) is a network protocol that defines how data is formatted and transmitted over the web, but it does not provide any security or encryption of the data1, p.90-91Reference:1: CDPSE Review Manual (Digital Version)