问题：
[单选题]34. 在路由器R1的帧中继子接口s0/0.1的配置信息中发现了命令service-policy output fred，那么下面 有关该CB标记策略映射的描述，哪一项是正确的?
A.该策略映射可以使用基于DE比特进行匹配的分类映射来分类数据包
B.该策略映射可以引用基于DSCP进行匹配的分类映射
C.该策略映射可以设置CoS
D.该策略映射可以设置CLP
E.该策略映射可以设置DE
Tags：思科认证CCIE路由和交换分类模拟试题
答案解析：
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