The description of MPLS, which is wrong? (Multiple choice)

The description of MPLS, which is wrong? (Multiple choice)
A . Before connecting a packet with MPLS label, you must establish a corresponding network connection.
B . The router can aggregate multiple IP flows according to the forwarding destination to form a forwarding equivalence class (FEC).
C . MPLS supports various network layer protocols, and packets with MPLS labeling must be encapsulated in frames for transmission.
D . MPLS replaces IP forwarding with label switching
E . MPLS "tag" is the unique identifier of a particular group in each subnet

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Answer: BC