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Infrastructure as Code (IaC) significantly enhances deployment speed primarily by reducing the time required to set up environments. With IaC, infrastructure is defined and managed using code, allowing for quicker and more efficient creation, modification, and management of environments. This means that instead of spending time on manual configuration or installations, development and operations teams can deploy infrastructure in a consistent and repeatable manner almost instantaneously.

Using code to automate the setup of servers, networks, and other infrastructure components eliminates the need for manual intervention, minimizing human error and inconsistencies. This leads to faster iterations and the ability to rapidly spin up testing or production environments as needed, improving overall deployment speed.

The other choices do not effectively connect with the concept of Infrastructure as Code improving deployment speed. Automating restructuring of existing infrastructure could offer benefits but doesn't focus on speed as directly as setup. Manual deployment processes inherently slow down the pace as they require human involvement. Finally, requiring physical hardware for installations contradicts the principles of IaC, which promotes flexibility and virtualized infrastructures.