Which two statements about a sipne and-leaf data center design are true? (Choose two.)

Spine-and-leaf is explicitly a two-tier model; the traditional three-tier model consists of core, distribution, and access layers - spine-and-leaf was designed to collapse these into two layers.

The spine-and-leaf architecture consists of exactly two tiers - the spine layer and the leaf layer - making it a two-tier design that replaces the traditional three-tier core-distribution-access hierarchy.

Spine switches correspond to the aggregation/distribution layer in a traditional three-tier design, not the access layer, providing high-speed interconnection between all leaf switches.

Spine switches do not connect directly to one another; instead, each leaf switch connects to every spine switch, which is the defining characteristic that ensures any-to-any communication in a predictable number of hops.

Leaf switches are the access tier where servers, storage, and endpoints connect, which is functionally equivalent to access switches in the traditional three-tier data center model.