During recombinant dna technology which structure is used to cut the dna at a specific site? restriction enzymes dna ligase dna helicase vector plasmid

Restriction enzymes are used to cut the DNA at a specific site.
The functions of others:
DNA helicase - to breakdown the hydrogens bonds in dna polymer
DNA ligase - is used to connect the DNA fragments
vector plasmid - is used to transfer a gene.

Is there any answer choices?

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