You are managing FortiGates across multiple ADOMs. How can you share common firewall objects (e.g., mail servers, common IP ranges) across these ADOMs?
Objects created in the Global Database are inherited by every ADOM, so common firewall addresses and services are defined once and referenced everywhere. This satisfies the cross-ADOM sharing requirement without duplicating objects in each ADOM, though per-ADOM objects cannot be shared upward.
Why this answer
In FortiManager, the Global Database (Global ADOM) is the designated object space for creating firewall objects that must be shared across multiple ADOMs. Objects defined there can be referenced by policies in any ADOM, providing a single source of truth for common items like mail servers and IP ranges.
Exam trap
The trap is assuming there is a per-ADOM sharing setting or that scripting is the intended solution; Fortinet exams test knowledge of the Global Database as the native cross-ADOM object mechanism.
How to eliminate wrong answers
Option B is wrong because manually copying objects into each ADOM creates duplication and drift, defeating the purpose of centralized management. Option C is wrong because scripting object creation via the API in every ADOM still results in duplicated objects and does not provide native cross-ADOM sharing. Option D is wrong because there is no 'Object Sharing' toggle in system settings that enables cross-ADOM object reuse; the correct mechanism is the Global Database.