A port on an ArubaOS switch has its default spanning tree settings. When is the port defined as a spanning tree edge port?

A port on an ArubaOS switch has its default spanning tree settings. When is the port defined as a spanning tree edge port?
A . when the switch and the connected switch run MSTP but have different region settings
B . when the switch runs MSTP but the connected switch runs RSTP
C . when the port fails to receive BPDUs on the port within a set period of time
D . when the port is part of a VLAN that is dedicated to that port alone

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Answer: B