Answer only question 4. Software Testing fifth edition (A Craftsman's Approach approach) chapter 5 question answer needed. Please answer the below question which is question 4. Thanks

3. What would we learn from Robust Normal Boundary Value test cases for the Quadrilateral Program? The values are: c1. 0a201 (top) c2. 0b201 (left side) c3. 0c201 (bottom) c4. 0d201 (right side) 4. Discuss the extent to which any form of boundary value testing would be helpful/appropriate for the Quadrilateral Program