Which are the two parts in the port identifier of the uplink interface on a non-root switch?

Which are the two parts in the port identifier of the uplink interface on a non-root switch?
A. 1-bit port priority and 1-bit port number
B. 1-bit port priority and 2-bit port number
C. 2-bit port priority and 1-bit port number
D. 2-bit port priority and 2-bit port number

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