which three scenarios is media recovery required?

In which three scenarios is media recovery required?

A.
when a tablespace is accidentally dropped from a database

B.
when archived redo log files are lost

C.
when data files are lost

D.
when one of the online redo log members is corrupted

E.
when all control files are lost

Explanation:

Reference:
http://docs.oracle.com/cd/A87860_01/doc/server.817/a76993/recoscen.htm