【单项选择题】
A GRE tunnel is configured between a local and a remote site. Where should the service policy be applied to classify packets based on the pretunnel header? （）
A、A.in global configuration mode， apply the service policy and use the qos pre-classify
B、B.in global configuration mode， apply the service policy but do not use the qos pre-classify command
C、C.apply the service policy on the physical interface but do not use the qos pre-classify
D、D.apply the service policy on the tunnel interface but do not use the qos pre-classify command
E、E.apply the service policy on the tunnel interface and use the qos pre-classify command
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