Whilereviewingclusterlogs，andadministratornoticethatanevent，network_downrs232a，occurredonthepreviousday.Afterverifyingthephysicalnetworkconnectionsanddevicestates，whatcommandcanbeusedtoverifytheclusterstate？（）

A.clstat

B.cllsif

C.clsnapshotinfo

D.clcheck_server