To answer this question, the user needs to have knowledge of database access methods.

The correct answer is:

D. A or B

Explanation:

CBLTDLI and PLITDLI are both programming interfaces for accessing databases. CBLTDLI is a COBOL interface, and PLITDLI is a PL/I interface. Both interfaces are used to submit commands and retrieve data from databases. Therefore, either option A or option B can be used to access the database. Option C is incorrect because only option A or B can be used to access the database, not just option A.