Match the following:
| (i) Half wave rectifier | p) Transformer not required |
| (ii) Full wave rectifier | q) Centre tap transformer required |
| (iii) Full wave bridge rectifier | r) Ordinary transformer required |
1
(i)-p, (ii)-q, (iii)-r
2
(i)-r, (ii)-q, (iii)-p
3
(i)-q, (ii)-p, (iii)-r
4
(i)-r, (ii)-p, (iii)-q