In the initial FortiOS 7.0 release, the GUI for configuring SD-WAN Performance SLAs (also known as Health Checks) provided a limited set of protocols, including Ping and DNS. The command-line interface (CLI), however, offered a more extensive list of configurable protocols. Among the options in the question, both Two-Way Active Measurement Protocol (TWAMP) and udp-echo were available in the CLI but were absent from the GUI in that release. While udp-echo was later added to the GUI in a subsequent minor version (7.0.1), TWAMP remains a CLI-only configuration option. Therefore, based on the foundational 7.0 version, both are correct.

A. DNS: This protocol has been a standard option available for selection directly within the Performance SLA GUI since the initial FortiOS 7.0 release. C. ping: This is the default and most common protocol for health checks and has always been a primary, visible option in the Performance SLA GUI.

1. Fortinet FortiOS 7.0.0 Administration Guide, Page 900, "SD-WAN > To create a new Performance SLA in the GUI:". Step 6 and the accompanying screenshot list the available GUI protocols as "Ping, HTTP, TCP Echo, or DNS," which notably excludes udp-echo and TWAMP.

2. Fortinet FortiOS 7.0.0 CLI Reference, Page 3198, "config system sdwan > config health-check". The entry for set protocol lists the available options as {ping | tcp-echo | udp-echo | http | https | dns | ftp | twamp}, confirming that both udp-echo and twamp were available in the CLI from the initial 7.0 release.

3. Fortinet FortiOS 7.2.4 Administration Guide, Page 1030, "SD-WAN > Performance SLA". This later guide shows that udp-echo was added to the GUI's protocol list, illustrating the version-specific nature of the question, but TWAMP remains absent from the GUI options.