| List I (Books) | List II (Author) | ||
| A | Iron | I | Body water balance and nerve function |
| B | Calcium | II | Digestion and metabolism |
| C | Sodium | III | Constituent of haemoglobin |
| D | Zinc | IV | Blood clotting and nerve transmission |
In supervised digital image classification, the number of combinations to be evaluated to select three best bands out of five bands is _____________