单选题Please match the Cisco STP enahancement term to its definition.（） (1) BPDU guard (2) PortFast (3) BackboneFast (4) Loop guard (5) Root guard (a) shuts down a port that receives a BPDU when enabled (b) cuts convergence time by mas-age for indirect failure (c) prevents the aliernate or root port from being designated in absence of BPDUs (d )causes Layer 2 LAN interface access port to immediately enter the forwarding state (e) helps prevent bridging loops due to jni-directional link failures on point-to-point linksA（a）-（1）；（b）-（2）；（c）-（4）；（d）-（5）；（e）-（3）B（a）-（4）；（b）-（3）；（c）-（2）；（d）-（5）；（e）-（1）C（a）-（3）；（b）-（2）；（c）-（4）；（d）-（5）；（e）-（1）D（a）-（1）；（b）-（3）；（c）-（4）；（d）-（2）；（e）-（4）
单选题
Please match the Cisco STP enahancement term to its definition.（） (1) BPDU guard (2) PortFast (3) BackboneFast (4) Loop guard (5) Root guard (a) shuts down a port that receives a BPDU when enabled (b) cuts convergence time by mas-age for indirect failure (c) prevents the aliernate or root port from being designated in absence of BPDUs (d )causes Layer 2 LAN interface access port to immediately enter the forwarding state (e) helps prevent bridging loops due to jni-directional link failures on point-to-point links
A
（a）-（1）；（b）-（2）；（c）-（4）；（d）-（5）；（e）-（3）
B
（a）-（4）；（b）-（3）；（c）-（2）；（d）-（5）；（e）-（1）
C
（a）-（3）；（b）-（2）；（c）-（4）；（d）-（5）；（e）-（1）
D
（a）-（1）；（b）-（3）；（c）-（4）；（d）-（2）；（e）-（4）
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