If a teammate modifies an infrastructure component you are working on after you ran terraform plan, will the apply plan remain the same?

When a teammate modifies an infrastructure component after you have run terraform plan, the apply plan will differ. This difference arises because Terraform generates a plan based on the current state of the infrastructure as recorded in the state file and the desired configuration that you specify in your Terraform files. If any changes are made to the infrastructure after the terraform plan command is executed, those changes won't be reflected in the state file until you apply them.

When you run the terraform apply command, Terraform recalculates the current state compared to the desired state defined in your configuration. If there have been any modifications in the actual infrastructure, the apply will detect those changes and may produce a different outcome than what was presented in the initial plan. These changes may include updates made by your teammate or external changes that were not initiated through Terraform.

Therefore, it is crucial to communicate with team members and ensure that everyone understands the current state of the infrastructure and any changes made to it before running the terraform apply. This practice helps to avoid unexpected results or conflicts. The other options imply a static relationship between the plan and the current state or enable misinterpretations of changes, which does not account for the dynamic nature of infrastructure managed by Terraform.