Which three strategies are valid SD-WAN rule strategies for member selection? (Choose three.)

FortiOS SD-WAN rules provide several strategies for member selection. The 'Manual' strategy allows an administrator to statically select one or more interfaces; if multiple interfaces are chosen, traffic is load-balanced across them. The 'Lowest Cost (SLA)' strategy selects the member with the lowest configured cost that also meets the performance SLA. If multiple members meet the SLA and share the same lowest cost, FortiGate load-balances traffic among them. If only one member qualifies (either by cost or SLA), it is selected exclusively, resulting in no load balancing. These behaviors validate options A, B, and E.

C. Best Quality with load balancing: The 'Best Quality' strategy is designed to select only the single best-performing link based on the SLA criteria (latency, jitter, packet loss); it does not perform load balancing.
D. Lowest Quality (SLA) with load balancing: 'Lowest Quality' is not a valid member selection strategy in FortiOS SD-WAN. FortiGate prioritizes the best-performing and most cost-effective links.

1. Fortinet NSE Institute. (2021). NSE 4 FortiGate Security 7.2 Study Guide. Page 318, "SD-WAN Rules". The guide states for the 'Lowest Cost (SLA)' strategy: "If multiple members have the same cost, FortiGate load balances traffic between them." This supports option B.

2. Fortinet. (2023). FortiOS 7.4.2 SD-WAN Administration Guide. Page 41, "Strategy". This document describes the 'Manual' strategy, where selecting multiple interfaces is an option, and the 'Best Quality' strategy, which "chooses the best link" (singular). This supports option A and invalidates option C.

3. Fortinet. (2023). FortiOS 7.4.2 SD-WAN Administration Guide. Page 41, "Strategy". The description for 'Lowest Cost (SLA)' confirms it selects the link with the lowest cost that meets the SLA. This describes the fundamental behavior covered in option E.