We have obtained access to the company's operational data. we examine 50 records for customers with phone numbers that should use the current area code of 345. of these 50 records, we find 10 that still use an older area code, 567. this is an example of

E. inconsistent data

Explanation:

Based on the information provided within the question it can be said that this is an example of inconsistent data. This refers to data that is different but kept in the same files as each other, which that file describes all of the content as being the same. Which is what is happening in this scenario since the 50 records that were examined should all have an area code of 345, but instead some of the files had an area code of 567.

answer; middle level managers;