When implementing LDP, what is liberal label retention mode?

When implementing LDP, what is liberal label retention mode?
A . To reduce the convergence time, the LSR will retain all the received labels in its LIB even if all the neighbor LSRs go down temporary
B . The LSR can assign it’s own label for each destination network even though it has not been assigned a next hop label from the neighbor LSR
C . The LSR will store the label received from the downstream LSRs in its LIB even if the downstream LSRs are not the next hop for the destination
D . The LSR will not perform PHP if it is operating in liberal label retention mode

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Answer: C