Exam 200-301 topic 1 question 828 discussion

It is D, you can verify that with previous questions

Collapsed Core Architecture is a campus network design wherein we combine the core and distribution layers. https://study-ccna.com/collapsed-core-and-three-tier-architectures/

Collapsed Core (Two-tier) Architecture A small organization may not need to use a three-layer model, so it can combine the DISTRIBUTION AND CORE LAYERS into A SINGLE LAYER known as a collapsed layer. This makes the collapsed core layer a two-layer model, comprising the access layer and the collapsed distribution/core layer. In a typical scenario, this may be used in a small company that uses only a few floors in a building for their network. Each floor would have a switch (access layer) that enables clients on that floor to connect to the network. Each floor switch would then connect to a central switch in the building, which is connected to a router to access the WAN or Internet. All-in-One CCT/CCNA Routing and Switching

B. Only a three tier has a core so the answer can't be D. That's my view on it anyway.

B. It enables the core and access layers to connect to one logical distribution device over an EtherChannel. In a collapsed-core network topology, the core and access layers connect to one logical distribution device (usually a switch or a set of switches) over an EtherChannel or aggregated link. This design simplifies the network architecture by reducing the number of layers and devices required, which is often suitable for small to medium-sized networks. It's a way to collapse the traditional hierarchical three-layer network design into fewer layers, making management and configuration simpler.