Which of the following is considered to be a secure method for communication according to PCI DSS requirements?

SSH, or Secure Shell, is considered a secure method for communication according to PCI DSS requirements because it uses encryption to secure traffic between the client and the server. This protection includes authentication, confidentiality, and data integrity, which are critical when handling sensitive information such as cardholder data.

SSH mitigates the risks associated with eavesdropping and man-in-the-middle attacks, enabling secure remote access and file transfers. By using cryptographic techniques, SSH ensures that any data transmitted remains private and unaltered, making it suitable for environments that require compliance with PCI DSS standards.

In contrast, other options, such as FTP, Telnet, and RTSP, do not provide the same level of security for data in transit. FTP and Telnet transmit data in plaintext, making them susceptible to interception and attacks. RTSP, primarily used for streaming media, also lacks encryption for the control and data channels, rendering it insecure in contexts where sensitive data needs protection. Thus, SSH stands out as a secure communication method that aligns with PCI DSS requirements.