D is corrent. In cooperative processing, microcomputers are more cost effective than mainframes for data entry and presentation because microcomputers are better suited to frequent screen updating and graphical user interfaces.
A is incorrect. Given the decades of refinement of them, mainframes are generally more reliable than microcomputers.
B is incorrect. Microcomputer use is less conducive to data integrity than mainframe use because less control over use is possible in microcomputer environments.
C is incorrect. Microcomputer use is less controllable than mainframe use.
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