Which of the Following Statements Correctly Describe the LDP LSP

Which of the following statements correctly describe the LDP LSP establishment process?

A) When the next hop of an LSR changes due to a change in network topology and liberal mode is used, the LSR can use the previous label sent to a non-optimal next hop to quickly reestablish an LSP. Liberal mode requires more memory and label space than conservative mode.
B) By default, for the same FEC, the label mapping that an LSR receives can only originate at the optimal next hop.
C) In DoD label advertisement mode, an LSR can distribute labels to a specified FEC without having to receive Label Request messages from its upstream device.
D) An LSP is established by binding an FEC to a label and advertising the binding relationship to the upstream LSR.