What is the final step after defining criteria in a summary query in Access?

After defining criteria in a summary query in Microsoft Access, the final step is to click the 'Run' button in the Query Tools Design tab. This action executes the query using the defined criteria and displays the results based on those specifications. Running the query is essential to see how well it performs in retrieving and summarizing the data you are interested in.

In the context of the other options, saving the query as a report is not the immediate final step; this action could occur after running the query, depending on what you want to do with the results. Exporting the query results to Excel is also a subsequent action that might be taken after viewing the query results. Closing the query window would typically come after ensuring that the query runs as expected; therefore, it cannot be the final step in executing the summary query. Running the query ensures that the criteria you have set effectively generates meaningful data outputs.