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Match the items of List-I with the items of List-II and choose the correct answer from the code given below.
| List-I | List-II |
| (a)X chart | (i) Number of defects |
| (b) P chart | (ii) Variations between samples |
| (c) C chart | (iii) Variations within samples |
| (d) R chart | (iv) Proportion of defectives |

