It shows the format of an IPv6 Router Advertisement packet. If the Router Lifetime value is set to 0, what does that mean? 

Answer options:

A. The router that is sending the RA is not the default router.
B. The router that is sending the RA is the default router.
C. The router that is sending the RA will never power down.
D. The router that is sending the RA is the NTP master.
E. The router that is sending the RA is a certificate authority.
F. The router that is sending the RA has its time synchronized to an NTP source.

A