Which three fields are optional in an OSPFv3 external LSA？（）A、Forwarding AddressB、External RouteC、Reference Link-State IDD、OptionE、Prefix Options
Which three fields are optional in an OSPFv3 external LSA？（）
- A、Forwarding Address
- B、External Route
- C、Reference Link-State ID
- D、Option
- E、Prefix Options
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