Fortinet distinguishes measured link-quality metrics from SLA targets. Best performance, called Best Quality in current FortiOS terminology, compares member performance using a selected quality criterion; it does not use an SLA target as the eligibility mechanism. Thus, A is correct.
SLA-target eligibility belongs to the Lowest Cost (SLA) strategy, including Lowest Cost with load balancing, making D correct. When an SD-WAN rule references a particular performance SLA, it selects one SLA target ID from that performance SLA, so E is also correct. Additional performance SLAs can be referenced separately, but multiple target IDs from the same SLA are not selected simultaneously in that rule reference.
Option B confuses measurement with eligibility. Performance SLA processes measure member metrics independently; configuring an SLA target supplies thresholds against which those measurements are evaluated. Consequently, B and C are incorrect.
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