An existence check is a data validation check that __________. tests data items

Question

An existence check is a data validation check that __________.

tests data items to verify that they fall between a specified minimum and maximum value

identifies values that are questionable, but not necessarily wrong

is performed on two or more fields to ensure that they are consistent or reasonable when considered together

is used for mandatory data items

tests data items to verify that they fall between a specified minimum and maximum value

identifies values that are questionable, but not necessarily wrong

is performed on two or more fields to ensure that they are consistent or reasonable when considered together

is used for mandatory data items

Explanation / Answer

Option #4 (is used for mandatory data items).

Existence check is a data validation check that is used to prevent fatal errors in a program when mandatory data is missing. For example, checking for the existence of a file before reading it to avoid errors while executing the code.

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