Which statement is true concerning the core layer within the hierarchical design model?

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Which statement is true concerning the core layer within the hierarchical design model?

Remote users are granted access to the network through the core.
Routing should be configured without traffic filtering, address translation, or other packet manipulation at the core.
The core, which acts as the front door to a network, is designed to prevent unauthorized users from gaining entry.
The core provides an optimized and reliable transport structure by using a combination of route summaries, distribution lists, and route maps.