Which argument is required when declaring a Terraform variable?

Which argument is required when declaring a Terraform variable?

• A. type
• B. default
• C. description
• D. None of the above

Answer: (D)

In Terraform, declaring a variable doesn't require any of those arguments. All of type, default, and description are optional in the variable block. If you provide a default, that value is used automatically. If you don’t provide a default, Terraform will require a value at runtime (via -var, a tfvars file, or an environment variable) or prompt you for input during plan/apply (unless input is disabled). So there isn’t a strictly required argument in the declaration itself, which is why None of the above is the best answer. For example, you can declare a variable with nothing inside the block: variable "image_id" { }.

In Terraform, declaring a variable doesn't require any of those arguments. All of type, default, and description are optional in the variable block. If you provide a default, that value is used automatically. If you don’t provide a default, Terraform will require a value at runtime (via -var, a tfvars file, or an environment variable) or prompt you for input during plan/apply (unless input is disabled). So there isn’t a strictly required argument in the declaration itself, which is why None of the above is the best answer. For example, you can declare a variable with nothing inside the block: variable "image_id" { }.