Which description is true of what the fast-reroute keep-all-paths command accomplishes when under OSPF process?

Which description is true of what the fast-reroute keep-all-paths command accomplishes when under OSPF process?
A . Besides the regular LFA backup paths, this command also installs the remote LFA backup paths
B . By default, only the/32 routes have a backup path installed. This command creates a backup path for the router with any subnet mask
C . All backup routes-not only the best backup route-are installed in the OSPF RIB
D . All possible alternate routes are installed in the OSPF RIB, even if the alternate paths do not meet LFA criteria (the LFA inequalities)

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Answer: C