Given the segment of code in the exhibit, what is the appropriate text for the variable what_error_message?

Click the <<ItemExhibitName>> button to view the exhibit.

Given the segment of code in the exhibit, what is the appropriate text for the variable what_error_message?
A . The serial number you entered is not valid.
B . Duplicate equipment records are not allowed.
C . Equipment was not found, please re-enter the serial number.
D . Null values are not allowed in name, serial number, make, or model fields.

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Answer: B