What is causing this behavior?

A technician creates a new connection between two switches. After configuring the VLANs, the technician looks at the MAC table and sees no MAC addresses learned on the new interface. When looking at "show spanning-tree", the technician sees the port mode is "Alt."
What is causing this behavior?
A. The root bridge priority must be configured.
B. The link is physically down.
C. Spanning Tree detected a loop.
D. A broadcast storm is causing traffic loss.

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