This is the command that can add existing resources into Terraform state, by matching them with the corresponding configuration blocks in your files.

You should run terraform init after you start coding a new Terraform project and before you run terraform plan for the first time. This command will initialize the working directory by downloading the required providers and modules, creating the initial state file, and performing other necessary tasks. References = :
Initialize a Terraform Project

Runningterraform destroywill show all resources that will be deleted before prompting for approval. You can also runterraform plan -destroyto simulate the destruction without actually applying it, which is useful for reviewing the planned changes.
References:
Terraform Destroy

This is the variable type that you could use for this input, as it can store multiple attributes of different types within a single value. The other options are either invalid or incorrect for this use case.

terraform initretrieves and caches providers and modules, butonly for explicitly declared modulesin the configuration.
If a module isadded or updated, terraform init needs to be re-run to download the new version.
Terraform does not automatically cache all remote modules unless they are explicitly referenced in the configuration.
Official Terraform Documentation Reference:
terraform init - HashiCorp Documentation