Which is wrong about the description of MPLS?

Which is wrong about the description of MPLS?
A . MPLS supports various network layer protocols. Packets with MPLS labeling must be encapsulated in PPP frames for transmission.
B . MPLS "tags" are unique identifiers for specific groups in each subnet
C . The router can aggregate multiple IP flows according to the forwarding destination to form a forwarding equivalence class (FEC).
D . Before connecting a packet with MPLS label, you must establish a corresponding network connection.
E . MPLS replaces IP forwarding with label switching

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Answer: A