How many predefined Security Zones as a starting point are available in a newly installed...

The correct answer is B. The uploaded key is correct here: R82 documentation lists four predefined Security Zones: WirelessZone, ExternalZone, DMZZone, and InternalZone. Earlier examples often show three typical zones—ExternalZone, DMZZone, and InternalZone—but the full predefined list also includes WirelessZone. That distinction is exactly what this question is testing. Option C is tempting because many diagrams show the classic three-zone model, but the official predefined list has four. Option A and D are unsupported counts. Security Zones are useful because they allow policy rules to refer to logical parts of the network rather than specific gateway interfaces or raw addresses. Administrators can then assign interfaces to zone objects and write simpler, more scalable rules. Reference topics: Security Zones, Predefined Security Zones, WirelessZone, ExternalZone, DMZZone, InternalZone.