Match the items of List I with the items of List II regarding operations research models and their bases of categorisation and indicate the code of their correct matching.
| List-I (Type of Model) | List-II (Basis of Categorisation) |
| a. Analogue model | 1. Nature of environment |
| b. Descriptive model | 2. Method of getting the solution |
| c. Deterministic model | 3. Structure |
| d. Simulation model | 4. Utility |
A. a-1, b-2, c-3, d-4
B. a-3, b-4, c-1, d-2
C. a-2, b-4, c-1, d-3
D. a-4, b-2, c-3, d-1
Answer: Option B

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