which BGP configuration group allows you to define address-family independent commands and address-family dependent commands for each address family?

On Cisco IOS-XR, which BGP configuration group allows you to define address-family
independent commands and address-family dependent commands for each address family?

A.
neighbor-group

B.
session-group

C.
af-group

D.
peer-group

Explanation:
•Commands relating to a peer group found in Cisco IOS Release 12.2 have been removed
from Cisco IOS XR software. Instead, the af-group, session-group, and neighbor-group
configuration commands are added to support the neighbor in Cisco IOS XR software:
–The af-group command is used to group address family-specific neighbor commands within
an IPv4 or IPv6 address family. Neighbors that have the same address family configuration
are able to use the address family group name for their address family-specific configuration.
A neighbor inherits the configuration from an address family group by way of the use
command. If a neighbor is configured to use an address family group, the neighbor will (by
default) inherit the entire configuration from the address family group. However, a neighbor
will not inherit all of the configuration from the address family group if items are explicitly
configured for the neighbor.
–The session-group command allows you to create a session group from which neighbors can
inherit address family-independent configuration. A neighbor inherits the configuration from
a session group by way of the use command. If a neighbor is configured to use a session
group, the neighbor (by default) inherits the session group’s entire configuration. A neighbor
does not inherit all the configuration from a session group if a configuration is done directly
on that neighbor.
–The neighbor-group command helps you apply the same configuration to one or more
neighbors. Neighbor groups can include session groups and address family groups. This
additional flexibility can create a complete configuration for a neighbor. Once a neighbor
group is configured, each neighbor can inherit the configuration through the use command. If

a neighbor is configured to use a neighbor group, the neighbor (by default) inherits the
neighbor group’s entire BGP configuration.
–However, a neighbor will not inherit all of the configuration from the neighbor group if
items are explicitly configured for the neighbor. In addition, some part of the neighbor
group’s configuration could be hidden if a session group or address family group was also
being used