A snack food company experimented with the frequency of its advertising by working with a local cable provider. On the north end of the city, the frequency was high, while it was only moderate on the south end of town. The company then obtained the checkout scanner data from grocery stores in each part of town for comparison. This is a form of:.

sales test

Explanation:The Sales test evaluates a candidate's ability to complete the sale of goods or services on behalf of a company, including related interactions with prospective and current customers before, during, and after completion of the sale.

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b. take periodic breaks and alternate between tasks.  

will increase work efficiency, and avoid health issues.