What does a double-entry check involve?

• A. It ensures the data is within a fixed range.
• B. It validates that the data is present.
• C. It checks the data format using a single entry.
• D. It involves entering data twice to detect typing mistakes.

Answer: (D)

Double-entry checks are about catching typing mistakes by entering the same data twice and comparing the two entries. The idea is that a second independent entry will reveal any slip or transposition you made the first time, because the two values won’t match if a mistake occurred. This method helps ensure accuracy before the data is saved or used.

Why this fits best: it directly targets detecting errors in the act of entering data, which is what double-entry verification is designed to do. The other ideas describe different validations—checking that a value is within a permitted range, ensuring something is present, or validating the format of a single entry—but they don’t involve confirming consistency between two separate entries.