View the exhibit. In the example network shown in the exhibit, switch A loses power and becomes unavailable. Which switch ports have the designated role in instance 1 when the MSTP network converges again?
A. Ports A2 and B10 on switch C
B. Ports B7 on switch D and B10 on switch C
C. Ports A20 and B21 on switch B
D. Ports B7 and B12 on switch D
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