Which MST configuration statement is correct？ （）
A. MST configurations can be propagated to other switches using VT
B. After MST is configured on a Switch， PVST+ operations will also be enabled by default.
C. MST configurations must be manually configured on each switch within the MST region.
D. MST configurations only need to be manually configured on the Root Bridge.
E. MST configurations are entered using the VLAN Database mode on Cisco Catalyst switches.
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