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Combinatorial testing using pairwise (all-pairs) coverage
ACovers every possible n-way combination exhaustively
BCovers only one value of each parameter
CCovers no combinations at all by design
DCovers all combinations of every pair of parameters
Answer & Solution
Correct answer: D. Covers all combinations of every pair of parameters
Pairwise testing ensures every pair of parameter values appears in at least one test, capturing most interaction defects with far fewer cases than full Cartesian product. Tools: PICT, ACTS, AllPairs.
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