D is incorrect (and E is correct) as per the route-selection hierarchy on p 130:
Policy route > ISDB route > SD-WAN rules > route cache > RIB/FIB
(i.e., both policy routes and ISDB routes take precedence over SD-WAN rules).
A is correct because this is general routing logic -- if there is not valid route through an interface, the member is not a candidate path.
B is a direct quote from principle 4 on page 126
C is incorrect, because FortiGate will recalc routes on existing sessions if preserve-session-route is disabled, or if the gateway through the current session's member goes down
A. By default. SD-WAN members are skipped if they do not have a valid route to the destination.
B. By default. SD-WAN rules are skipped if the best route to the destination is not an SD-WAN member.
E. Regular policy routes have precedence over SD-WAN rules.
(pag 124 Sd WAN Study guide for fortios-72)
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