Which of the following enzyme that is responsible for unwinding of DNA helix?

Helicase is an enzyme that unwinds and separates the two strands of the DNA double helix. There are DNA and RNA helicases. A ligase that facilitates the joining of DNA strands together by catalyzing the formation of a phosphodiester bond. DNA primase is the polymerase that synthesizes small RNA primers for the Okazaki fragments made during discontinuous DNA replication. A DNA polymerase is an enzyme that catalyzes the formation of polynucleotide chains through the addition of successive nucleotides derived from deoxynucleoside triphosphates.