Which of the following best describes downstream on demand label distribution?

Which of the following best describes downstream on demand label distribution?
A . An LSR answers requests for label mappings immediately, without waiting for a label mapping from the next-hop.
B . An LSR advertises label mappings to all peers for which it might be a next-hop for a given FE
D . An LSR distributes a label mapping for a FEC when it has been requested to do so.
E . An LSR propagates a label mapping downstream for a FE
F . only if it has a label mapping for the FEC’s next-hop.

Answer: C