A module cannot always refer to all variables declared in its parent module, as it needs to explicitly declare input variables and assign values to them from the parent module's arguments. A module cannot access the parent module's variables directly, unless they are passed as input arguments.

B (terraform init)-Must be run firstto initialize the Terraform working directory, download providers, and configure the backend.
A (terraform apply)- Requires initialization first, so itcannotbe run before terraform init.
C (terraform plan)- Also requires terraform init first to generate a plan.
D (terraform show)- Displays the state,not relevantfor first-time deployment.
Official Terraform Documentation Reference:
terraform init - HashiCorp Documentation

When declaring a Terraform output, thevalueargument is required. Outputs are a way to extract information from Terraform-managed infrastructure, and thevalueargument specifies what data will be outputted. While other arguments likedescriptionandsensitivecan provide additional context or security around the output, valueis the only mandatory argument needed to define an output.References= The requirement of thevalue argument for outputs is specified in Terraform's official documentation, which provides guidelines on defining and using outputs in Terraform configurations.

The default "local" Terraform backend stores the state file in a local file named terraform.tfstate, which can be used to track and manage the state of your infrastructure3.

This is the recommended way to use a remote backend that needs authentication, as it allows you to provide the credentials via environment variables, command-line arguments, or interactive prompts, without storing them in the Terraform configuration files.