Which function does IP SLA ICMP ECHO operation perform to assist with troubleshooting?

Which function does IP SLA ICMP ECHO operation perform to assist with troubleshooting?
A . packet-loss detection
B . congestion detection
C . hop-by-hop response time
D . one way jitter measurement
E

Answer: C

Explanation:

IP SLA generates ICMP traffic and measures Round Trip Delay for entire path http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15-mt-book/ sla_icmp_echo.html