Match the items of List I with the items of List II and choose the correct answer.
| List-I | List-II |
| a. $$\overline X $$ Chart | 1. Number of defects |
| b. P Chart | 2. Variations between samples |
| c. C Chart | 3. Variations within samples |
| d. R Chart | 4. Proportion of defectives |
A. a-4, b-3, c-2, d-1
B. a-4, b-2, c-1, d-3
C. a-2, b-4, c-1, d-3
D. a-2, b-4, c-3, d-1
Answer: Option C

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