If a switch has 10 VLANs defined and active, how many instances of STP will run using PVST+ versus CST?

a. 1 for PVST+, 1 for CST
b. 1 for PVST+, 10 for CST
c. 10 for PVST+, 1 for CST
d. 10 for PVST+, 10 for CST


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