In Terraform 0.12 provider configuration, which keyword controls the version constraint for a provider?

• A. version_constraint
• B. version
• C. required_providers
• D. constraint

Answer: (B)

Version is the keyword used inside the provider configuration block within the required_providers section to specify which provider versions are acceptable. This constraint tells Terraform which versions it may install for that provider, ensuring compatibility with your configuration.

For example, in Terraform 0.12 you declare something like:

terraform {

required_providers {

aws = {

source = "hashicorp/aws"

version = "~> 3.0"

}

}

}

Here, the version line sets the constraint for the AWS provider. The other terms aren’t the Terraform keyword used for this purpose, and required_providers is just the container that holds these constraints, not the constraint itself.