Match the enzyme with its function in DNA replication.
| Column I | Column II |
|---|---|
| (a) DNA-dependent DNA polymerase | (i) Joins the discontinuously synthesised fragments |
| (b) DNA ligase | (ii) Unwinds the DNA helix |
| (c) Helicase | (iii) Synthesises a short RNA primer |
| (d) Primase | (iv) The main enzyme for polymerisation of deoxynucleotides |