What is the purpose of embargo rules in Prisma Access?

Embargo rules are a purpose-built, pre-defined Security policy rule construct in Prisma Access that lets an organization block inbound connection attempts — most commonly authentication attempts against the GlobalProtect portal, Explicit Proxy, or Remote Networks entry points — that originate from specific countries or regions, using Palo Alto Networks ' geolocation-based source address matching. Their defining behavior is unconditional blocking (a Drop action) of the specified source countries, which makes option C the accurate general description of their purpose; they exist to reduce attack surface against brute-force and credential-stuffing attempts by preventing connection attempts before normal identity-based Security policy would even be evaluated, since embargo rules are enforced as top-of-stack pre-rules using the reserved tag PA_predefined_embargo_rule. Option A is incorrect because embargo rules are a binary block mechanism, not a rate-limiting or throttling control — there is no partial-restriction behavior involved. Option B inverts the logic entirely; embargo rules are not an allow-list mechanism restricting traffic to only a permitted set of countries, they are a deny-list mechanism for specific countries while leaving all other geographies unaffected. Option D is too narrow and factually incorrect as a generalization: embargo rules are configurable for any country or region the organization chooses to specify, and are frequently used for the broader set of countries subject to export or sanctions restrictions, not a fixed three-country list.