Which term corresponds to values at the limits of input ranges?

• A. Abnormal test data
• B. Extreme test data
• C. Boundary test data
• D. Trace table

Answer: (B)

Testing values at the ends of the input range is about boundary testing. The term boundary test data directly targets the edge values where the allowed inputs meet their limits, and it often includes values just inside and just outside those limits to reveal off-by-one errors or unexpected behavior at the boundary. This focus on the extremes of the valid range is what makes boundary test data the right label for “values at the limits of input ranges.”

Extreme test data can involve very large or very small values, but it isn’t inherently tied to the exact boundaries of the input domain. Abnormal test data refers to invalid or unexpected inputs, which is a different concern, and a trace table is simply a record of step-by-step values during execution, not a category of input data.