220.Which statements describe the capabilities of the DBMS_NETWORK_ACL_ADMIN package? (Choose all that apply.)
A.It can be used to allow the access privilege settings for users but not roles.
B.It can be used to allow the access privilege settings for users as well as roles.
C.It can be used to control the time interval for which the access privilege is available to a user.
D.It can be used to selectively restrict the access for each user in a database to different host computers.
E.It can be used to selectively restrict a user's access to different applications in a specific host computer.
正确答案是BCD