What are three functions of a Tier-0 Gateway in a multi-tenant service provider environment? (Choose three.)

What are three functions of a Tier-0 Gateway in a multi-tenant service provider environment? (Choose three.)
A . acts as a default gateway for the tenant workloads
B . enables east-west connectivity to the tenant workloads
C . interconnects the Tier-1 gateways of multiple tenants
D . provides isolation between the tenants
E . provides first-hop routing for the tenant workloads
F . enables north-south connectivity to the tenant workloads

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Answer: C,D,E