Input validation in information systems: Which of the following checks cannot be carried out on input data supplied to a system?

Introduction / Context:
Input validation ensures data quality, security, and correctness. Common validation techniques include syntax, range, and consistency checks before data is accepted into a system.

Given Data / Assumptions:

• “Syntax check” validates format and pattern (e.g., date format, email pattern).
• “Range check” ensures numeric values fall within allowed limits.
• “Consistency check” compares related fields for logical coherence (e.g., start date before end date).

Concept / Approach:

All three types of checks are standard and widely implemented across applications, from form validation to database constraints and ETL pipelines. Therefore, none of these is “impossible to carry out.”

Step-by-Step Solution:

Verification / Alternative check:

Industry standards (e.g., input validation guidance in secure coding) enumerate these checks as foundational controls.

Why Other Options Are Wrong:

• Each individual check listed is possible and commonly used; “All of the above” would mean none can be done, which is false.

Common Pitfalls:

Assuming validation is limited to syntactic checks only; overlooking cross-field consistency rules that catch subtle errors.

Final Answer:

None of the above