Which of the following descriptions of MPLS is incorrect? (Multiple choice)

Which of the following descriptions of MPLS is incorrect? (Multiple choice)
A . MPLS: Multi-protocol Label Switching, a non-standardized routing and switching technology platform
B. P/PE: P (Provider) is the internal node of the MPLS network, and PE (Provider Edge) is the edge of the MPLS network
c. The operation of PE->P is Egress, adding MPLS labels to client signals
D. The operation of P->P is Ingress, which exchanges MPLS labels

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Answer: ACD