Decision support systems:
a. are used for operational, tactical, and strategic decision making.
b. are used only when making structured decisions.
c. provide reports with fixed and standard formats.
d. require user requests for reports developed by systems personnel.

Decision support systems are used for operational, tactical, and strategic decision making.  

Explanation:

A type of computer programme which is used for judgement, determination, course of action in any type of organization and also in business is known as decision support system.

It works with sift of huge massive data, compelling the comprehensive information which can be used for solving the problem and help to take decision. It presents target, revenue of project and also sales figure.

answer; when one group has an extremely high score at pretest;

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explanation: