Match the following techniques or instruments with their usage:
| (a) | Bioreactor | (i) | Separation of DNA fragments |
| (b) | Electrophoresis | (ii) | Production of large quantities of products |
| (c) | (iii) | Detection of pathogen, based on antigen-antibody reaction | |
| (d) | (iv) | Amplification of nucleic acids |
Select the correct option from following: