In an MPLS label within this network, if the stack bit is set to 1, which of the following statements is correct?

The HW network is being used to provide MPLS VPN services to its customers.

In an MPLS label within this network, if the stack bit is set to 1, which of the following statements is correct?
A . The stack bit is a Huawei-only implementation and is only used when LDP is the label distribution protocol.
B . The stack bit is reserved for future use.
C . The stack bit is only used when LDP is the label distribution protocol.
D . It signifies that this is the top entry in the label stack and remains set to 1 until only the last entry, when the bottom label is reached.
E . It signifies the last entry in the label stack.

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Answer: E