Match List I with List II
| List I | List II |
|---|
| A. | Number of transfer units | I | Boiler |
| B. | Periodic flow of heat exchanger | II | Deposition on heat exchanger |
| C. | Phase change | III | A measure of size of heat exchanger |
| D. | Fouling factor | IV | Regenerators |
Choose the correct answer from the options given below: