For a function of two variables, boundary value analysis yields,

1. A4 n+3 test cases
2. B4 n+1 test cases
3. Cn+4 test cases
4. D2 n+4 test cases Q

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Correct answer: B. 4 n+1 test cases

Explanation

Basic BVA gives 4n + 1 test cases for n variables (min, min+, max−, max for each variable, plus one all-nominal case): 9 for two variables.