Which of the Following Statements Regarding the Basic MPLS Forwarding

Which of the following statements regarding the basic MPLS forwarding process is false?

A) When an IP packet enters an MPLS domain, the device checks whether the tunnel ID corresponding to the destination IP address of the packet is 0x0. If so, the MPLS forwarding process starts.
B) By default, the egress node supporting PHP allocates the label with the value of 3 to the penultimate hop.
C) A transit node replaces a label on the top of the label stack in an MPLS packet with the label assigned by the next hop.
D) When an IP packet enters an MPL5 domain, the MPLS edge device inserts a new label between the Layer 2 header and the IP header of the packet.