What is true about Unicast RPF in strict mode？（）
A. It works well with a multihomed environment.
B. It will inspect IP packets that are encapsulated in tunnels， such as GRE，LT2P，or PPT
C. uRPF is performed within the CEF switching path.
D. There might be a problem with DHCP as Unicast RPF is blocking packets with a 0.0.0.0 sourceaddress.
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