My mother asked me to repeat ________ phone number ________ second time so that she could write it down.

A．the; a

B．a; a

C．a; the

D．the; the

如果要启用所有角色，则应该使用哪一个命令？（）

A.SET ROLE ALL

B.SET ROLE ENABLE ALL

C.ALTER SESSION ALL

D.ALTER USER ROLE ALL