Spanning Tree Protocol IEEE 802.1 s defines the ability to deploy which of these?

A.
One global STP instance for all VLANs

B.
One STP instance for each VLAN

C.
One STP instance per set of VLANs

D.
One STP instance per set of bridges

Explanation:
The IEEE 802.1s standard is the Multiple Spanning Tree (MST). With MST, you can group VLANs
and run one instance of Spanning Tree for a group of VLANs. Other STP types:
Common Spanning Tree (CST), which is defined with IEEE 802.1Q, defines one spanning tree
instance for all VLANs.
Rapid Spanning Tree (RSTP), which is defined with 802.1w, is used to speed up STP
convergence. Switch ports exchange an explicit handshake when they transition to forwarding.