Enzyme Responsible for DNA Unwinding in Replication

During DNA replication, several enzymes play critical roles to ensure the accurate copying of genetic material. One of these enzymes is responsible for unwinding the double helix structure of DNA, allowing the replication machinery to access the strands. This enzyme is essential for initiating the DNA replication process at the replication fork.

Which of the following enzymes is primarily responsible for unwinding the DNA double helix during replication?