Which command is missing from the IP SLA configuration?

Refer to the exhibit.

ISP 1 and ISP 2 directly connect to the Internet. A customer is tracking both ISP links to

achieve redundancy and cannot see the Cisco IOS IP SLA tracking output on the router console .

Which command is missing from the IP SLA configuration?
A . Start-time 00:00
B . Start-time 0
C . Start-time immediately
D . Start-time now

Answer: D

Explanation:

Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15-mt-book/sla_icmp_echo.html