Terraformdownloads modules and providersinto the .terraform directory inside the working directory.
A (/tmp/)- Incorrect; modules arenot stored temporarily.
C (In memory)- Incorrect; modules persist on disk.
D (Not cached)- Incorrect; Terraformdoes cache modulesfor efficiency.
Official Terraform Documentation Reference:
Terraform Module Caching

This is not a valid Terraform variable type. The other options are valid variable types that can store different kinds of values2.

This is what will happen if you run terraform apply in the working directory again, after removing the resource definition from your Terraform configuration file. Terraform will detect that there is a resource in the state file that is not present in the configuration file, and will assume that you want to delete it.

If you manually destroy infrastructure, Terraform will automatically detect the change and update the state file during the next plan or apply. Terraform compares the current state of the infrastructure with the desired state in the configuration and generates a plan to reconcile the differences. If a resource is missing from the infrastructure but still exists in the state file, Terraform will attempt to recreate it. If a resource is present in the infrastructure but not in the state file, Terraform will ignore it unless you use the terraform import command to bring it under Terraform's management. References = [Terraform State]

This is how Terraform manages most dependencies between resources, by using the references between them in the configuration files. For example, if resource A depends on resource B, Terraform will create resource B first and then pass its attributes to resource A.