In which way does a spine-and-leaf architecture allow for scalability in a network when additional access ports are required?

In which way does a spine-and-leaf architecture allow for scalability in a network when additional access ports are required?
A . A spine switch and a leaf switch can be added with redundant connections between them
B . A spine switch can be added with at least 40 GB uplinks
C . A leaf switch can be added with connections to every spine switch
D . A leaf switch can be added with a single connection to a core spine switch

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Answer: C