Which two events will cause a slave server to create a new relay log file?

A.
Starting of the I/O thread

B.
Execution of the FLUSH LOGS statement

C.
Starting of the SQL thread

D.
Reaching the slave_pendign _jobs_size_max limit

E.
Execution of FULSH TABLES WITH READ LOCK

Explanation:
Reference: http://dev.mysql.com/doc/refman/5.1/en/slave-logs-relaylog.html