Which version of spanning tree is recommended for the enterprise campus?（）

A. to ensure a loop-free topology
B. to protect against user-side loops
C. when a VLAN spans access layer switches
D. for the most deterministic and highly available network topology
E. because of the risk of lost connectivity without Spanning Tree Protocol

A. If no core layer is deployed, the design will be easier to scale.
B. If no core layer is deployed, there will be fewer cabling requirements.
C. If no core layer is deployed, the distribution switches should not be fully meshed.
D. A dedicated campus core layer is not needed for connecting fewer than five buildings.
E. A dedicated campus core layer should be deployed for connecting three or more buildings.