Which is a reason for using link-state testing rather than "ping testing" for public network adapters in IPMP groups in Solaris 10?

Which is a reason for using link-state testing rather than “ping testing” for public network adapters
in IPMP groups in Solaris 10?

A.
Link-state testing is always more robust.

B.
IPMP will do repair detection and fallback only if you use link-state testing.

C.
The cluster will only be able to monitor the state of IPMP groups if you use link state testing

D.
You do NOT have to consume public network IP addresses for test addresses if you use linkstate testing.