一个db2测试题，选择哪一个？多谢
What are the two security mechanisms that enable users to access DB2 data?
A.
Authentication and Clearance
B.
Authorization and Validation
C.
Validation and Certification
D.
Authentication and Authorization
A database administrator needs an alert generated when table space TS1 is filled up to 70% and all other table spaces are filled up to 80%. How can the DBA accomplish this using the Health Center?
A.
Change the Global Settings for all table spaces and then change the Object Settings for table space TS1.
B.
Change the Global Settings for all table spaces and then change the Instance Settings for table space TS1.
C.
Change the Instance Settings for all table spaces and then change the Object Settings for table space TS1.
D.
Change the Instance Settings for all table spaces and then change the Tablespace Settings for table space TS1.
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