下列属于关系型数据库的是（）  两项 A: Oracle B: BMySql C: CIMS D: DMongoDB

Consider typical High Availability (HA) solutions that do not use shared storage. Which three HA solutions do not use shared storage?（） A: AMysql NDB Cluster B: BMysql Replication C: CDistributed Replicated Block Device (DRBD) and Mysql D: DWindows Cluster and Mysql E: ESolaris Cluster and Mysql