A.You should consider creating a database availability group (DAG). Thereafter -ex03 and mbx2 should be added to the dag.
B.You should consider creating a public folder database on -ex04.Thereafter the replication settings should be changed on every public folder.
C.You should consider creating a public folder database on -ex04.Thereafter the replication settings should be changed on the public folder database.
D.You should consider creating a Failover Cluster.Thereafter -ex03 and -ex04 should be added to the failover cluster.