When you enable MST on the switch, what happens?
A. Enables RSTP and use BPDU type 2, maximum X instances to be used.
B. Enables RSTP and use BPDU type 4, maximum X instances to be used.
C. Disables RSTP and use BPDU type 2, maximum X instances to be used.
D. Disables RSTP and use BPDU type 4, maximum X instances to be used.
I’m gonna reword this answer:
A – Enabling MST also enables RSTP which uses the Type 2 BPDU (version 2) to better detect Legacy STP BPDUs. MST can support 65 (including Instance 0) instances inside a region. There is no maximum/limitations to how many regions you can have .
https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24062-146.html