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    Question

    Which data validation step is crucial to ensure that all

    entries in a customer email column are correctly formatted?
    A Checking for missing values in the column Correct Answer Incorrect Answer
    B Validating each entry against a regular expression pattern for email Correct Answer Incorrect Answer
    C Removing duplicate email addresses Correct Answer Incorrect Answer
    D Converting all entries to lowercase Correct Answer Incorrect Answer
    E Ensuring no entry contains numerical values only Correct Answer Incorrect Answer

    Solution

    A regular expression (regex) pattern is commonly used to validate email formats by checking for typical email components (e.g., "username@domain.com"). Validating data entries with regex ensures that each email address follows a standard pattern, preventing incorrectly formatted entries from passing through. This step is essential for data quality and accuracy, particularly in fields requiring specific structures, like email addresses in customer data. Option A is incorrect as it checks for completeness, not format accuracy. Option C is incorrect as removing duplicates is a data cleaning step, not a validation step for format. Option D is incorrect as converting to lowercase standardizes data but doesn’t ensure correct email format. Option E is incorrect as checking for numerical entries doesn’t confirm valid email structures.

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