What is the link cost in respect to STP?

A. Link cost is the latency of a frame traversing across the link.
B. Link cost is the calculation of all the ports in the path to the root bridge.
C. Link cost is the monetary cost to traverse a link.
D. Link cost is a numeric value associated with the speed of a link.

D. The link cost is a numeric value that represents the cost in speed of a link. The higher the numbers, the lower the speed of the link, thus a higher cost.