Why is FortiGate not generating any traffic for the performance SLA?

Refer to the exhibit.

Which contains a Performance SLA configuration.

An administrator has configured a performance SLA on FortiGate.

Which failed to generate any traffic.

Why is FortiGate not generating any traffic for the performance SLA?
A . Participants configured are not SD-WAN members.
B . There may not be a static route to route the performance SLA traffic.
C . The Ping protocol is not supported for the public servers that are configured.
D . You need to turn on the Enable probe packets switch.

Answer: D

Explanation:

Reference: https://docs.fortinet.com/document/fortigate/6.2.0/cookbook/478384/performance-sla-linkmonitoring