An engineer is asked to monitor the availability of the next-hop IP address of 172.16.201.25 every 3 seconds using an ICMP echo packet via an ICMP echo probe.
Which commands accomplish this task?

A.	router(config-ip-sla)#icmp-echo 172.16.201.25 source-interface FastEthernet 0/0
B.	router(config-ip-sla-echo)#timeout 3
C.	router(config-ip-sla)#icmp-jitter 172.16.201.25 interval 100
D.	router(config-ip-sla-echo)#frequency 3
E.	router(config-ip-sla)#udp-echo 172.16.201.25 source-port 23
F.	router(config-ip-sla-echo)#threshold 3