Ans should be A
sla-class sla-class-name preferred-color colors—To set multiple tunnels to use when data traffic matches an SLA class, include the preferred-color option, specifying two or more tunnel colors. Traffic is load-balanced across all tunnels. If no tunnel matches the SLA, data traffic is sent through any available tunnel. In this sense, color preference is considered to be a loose matching, not a strict matching, because data traffic is always forwarded, whether a tunnel of the preferred color is available or not. When no tunnel matches the SLA, you can choose how to handle the data traffic:
https://www.cisco.com/c/en/us/td/docs/routers/sdwan/command/sdwan-cr-book/config-cmd.html#r_sla_class_3907.xml
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