Which security zone is automatically defined by the system?

A.
The source zone

B.
The self zone

C.
The destination zone

D.
The inside zone

Explanation:
BD
A zone is a logical area where devices with similar trust levels reside. For example, we could define a DMZ for
devices in the DMZ in an organization. A zone is created by the administrator, and then interfaces can be
assigned to zones. A zone can have one or more interfaces assigned to it. Any given interface can belong to
only a single zone. There is a default zone, called the self zone, which is a logical zone.
Source: Cisco Official Certification Guide, Zones and Why We Need Pairs of Them, p.380