A.This can be accomplished by creating two MX records.Then the mx record for -ex05 should be assigned a priority of 20.Thereafter the mx record for -ex06 should be assigned a priority of 10.
B.This can be accomplished by creating two SRV records.Then the srv record for -ex05 should be assigned a priority of 20.Thereafter the srv record for -ex06 should be assigned a priority of 10.
C.This can be accomplished by creating two MX records.Then the mx record for -ex05 should be assigned a priority of 10.Thereafter the mx record for -ex06 should be assigned a priority of 20.
D.This can be accomplished by creating two SRV records.Then the srv record for -ex05 should be assigned a priority of 10.Thereafter the srv record for -ex06 should be assigned a priority of 20.