求助，有没有技术大神帮我解答几个问题啊，谢谢

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有没有技术大神帮我解答几个问题啊，谢谢
1.In case of single Controlling Bridge failure and there is no redundant CB, which statement better describes traffic forwarding at Port Extenders (PEs)?
A. Without CB, PEs will only continue to forward traffic for locally attached clients, but not between PEs (via uplinks)
B.Without CB, PEs will continue to forward traffic locally and between PEs, but not to/from CB
C.Without CB, PEs will continue to forward all traffic, except Broadcast/Unknown/Multicast
D. Without CB, PEs will not forward any types of traffic, including Unicast/Broadcast/Unknown/Multicast

2.Which technology can be useful for interoperating with Industrial Switches?
A.Stacking
B. ERPS
C.PIM-SM
D.Clustering

3.What is the typical topology deployed in a small campus?
A.OSPF
B.EAPS
C.Spanning Tree
D.Collapsed Core

4.In a 2-Tier/Collapsed core network, what are two major access level technologies?
A.Stacking
B.Extended Edge
C. xSTP
D. EAPS

5.Which technologies can be deployed with multiple ring topologies? (Select two)
A.EAPS
B. Extended Edge
C.Clustering
D.Stacking

6.You are designing network, where physical topology requires deployments of switches in rings. Customer needs sub-second L2 re-convergence and must remain operational even if dissected to several segments. Which two technologies can used to build such network?
A. ERPS
B.OSPF
C.Extended Edge
D.EAPS

7.What is the most commonly use technology at Core Layer for high availability?
A.Extended Edge
B.EAPS
C. Clustering
D. Stacking

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