[单选]
Refer to the exhibit. Look at the command output. What can you use to prevent this behavior？（）

A . UDLD （UniDirectional Link Detection）
B . spanning-tree loopguard
C . VTP mode transparent
D . switchport mode desirable

Which three approaches can be used while migrating from an IPV4 addressing scheme to an IPV6 scheme?（） statically map IPV4 address to IPV6 addresses。 configuration IPv4 tunnels between IPV6 islands。 use DHCPv6 to map IPV4 addresses to IPV6 addresses。 use proxying and translation to translate IPV6 packets into IPV4 packets。 configure IPV6 directly。 enable dual-stack routing。下列属于少耕或免耕的优点的是（）。增加土壤有机质。均衡土壤养分。松碎土壤。减轻病虫草害。挂运在旅客列车上的运输军事人员的车辆，其运价里程按（）计算货运价里程。客运运价里程。客运运价里程的百分之八十。客运运价里程的百分之九十。做人最重要的应该是（）以德为先，做有德之人。以才为现，做有才之人。以权为先，做有权之人。以钱为先，做有钱之人。上海贝尔TSS5C最大支持多少个GE作为NNI互联端口（） 2。 3。 4。 6。

Refer to the exhibit. Look at the command output. What can you use to prevent this behavior？（）

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[单选] Refer to the exhibit. Look at the command output. What can you use to prevent this behavior？ （）

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[单选]
Refer to the exhibit. Look at the command output. What can you use to prevent this behavior？（）