Data collected at checkout counters in a grocery store is an example of:feedback.input.information systems.output.processing.

The data collected at checkout counters in a grocery store is an example of input in information systems.

Here's the step-by-step explanation:

1. Information Systems: These are systems that collect, create, store, manipulate and distribute data. They are typically used in business and other organizations for decision-making.

2. Input: This is the data that is collected and entered into the system. In this case, the data collected at checkout counters in a grocery store (like items purchased, quantity, price, time of purchase etc.) is the input.

3. Processing: This is the next step in an information system where the input data is transformed into a more useful form. For example, the raw data from the checkout counter might be processed to find out total sales for the day, most popular items etc.

4. Output: This is the final product of the information system. It is the result of the processing stage. For example, the total sales report, inventory report etc.

5. Feedback: This is information about the output of a system which can be used to adjust, correct or improve the system. For example, if the sales report shows that a particular item is not selling well, the store might decide to run a promotion on that item.

So, in the context of your question, the data collected at checkout counters in a grocery store is an example of input in an information system.