When Karsh and Hagan Advertising Agency uses information found in the Nielsen Television Index Ranking Report published by Nielsen to plan television advertising schedules for its clients, it is relying on data.

External secondary

Explanation:

 The external secondary data is one of type of data which is store in the database eternally and it the information or data are collected from the external organization such as the data may store or collected from the various types of surveys, users feedback and the market

 According to the given question, the Karsh and the hagan is one of the advertisement agency which specifically uses the data from the ranking report so that is why the given information is basically relying on the external secondary data.        

  Therefore, External secondary is the correct answer.

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