198.What are the two different types of database duplication? (Choose two.)
A. Active
B. Passive
C. Online
D. Backup-based
E. Failure driven
Answer: AD
答案解析：
参考：http://blog.csdn.net/rlhua/article/details/13509067
复制数据库有两种：一是从活动的数据，一是从备份
