The systems that are used to interact with customers and run a business in real time are called . A) tactical systems B) strategic systems C) operational systems D) informational systems E) executive systems

C) operational systems.

Explanation:

This is been said to explain the the transactions that are been carried out in an organisation strictly on a daily basis. In many cases, it is seen to be tagged or called data warehousing. As seen in data warehousing where data cleaning, its integration and also its consolidation which is seen to be done by the means of integrating data and also by several heterogeneous sources that aid or enhances the analytical reporting and also decision making. All these courses are been applied to assist or in formation for a resourceful or productive business intelligence.

answer; correct answer is investing activity;

answer; test-retest;