Which Cisco IOS SAF Forwarder configuration is correct?

Refer to the following exhibit.

Which Cisco IOS SAF Forwarder configuration is correct?

A.
Exhibit A

B.
Exhibit B

C.
Exhibit C

D.
Exhibit D

Explanation:
Incorrect answer: BCD
Summary steps to configure IOS SAF forwarder is given below

1.
enable
2.
configureterminal
3.
router eigrpvirtual-instance-name
4.
service-family {ipv4 | ipv6} [vrfvrf-name]autonomous-systemautonomous-system-number
5.
topology base
6.
external-clientclient_label
7.
exit-sf-topology

8.
exit-service-family
9.
exit
10.
service-family external-client listen {ipv4 | ipv6}tcp_port_number 11.
external-clientclient-label
12.
usernameuser-name
13.
passwordpassword-name
14.
keepalivenumber
15.
exit

Link:
http://www.cisco.com/en/US/docs/ios/saf/configuration/guide/saf_cg_ps11280_TSD_Products_Co nfiguration_Guide_Chapter.html