Which Terraform command is used to initialize a working directory?

The command used to initialize a working directory in Terraform is indeed "terraform init." This command is essential for preparing the working directory for other Terraform commands. When you run "terraform init," it performs several important tasks including downloading the necessary provider plugins specified in your Terraform configuration files, initializing the backend for state storage, and setting up the directory structure for Terraform to work with.

"Terraform init" is typically the first command you should run after creating a new Terraform configuration. It ensures that the local workspace is ready for managing resources defined in your configuration files.

The other options listed do not correspond to any official Terraform commands. "terraform start," "terraform setup," and "terraform configure" are not recognized commands within the Terraform ecosystem, as they do not perform any functions related to initializing the workspace or handling the project setup. Therefore, focusing on "terraform init" is critical for understanding how to properly begin working with Terraform and manage infrastructure as code effectively.