Match the following enzymes of DNA replication with their respective functions:
p. DNA polymerase i. Helps unzip the DNA double helix
q. DNA ligase ii. Seals nicks between Okazaki fragments
r. DNA helicase iii. Lays RNA primers to which polymerase can add nucleotides
s. Primase iv. Adds nucleotides to the free 3’ end of RNA primers