Which command should you use to ensure a null resource in Terraform re-runs a backup process after script changes?

To ensure that a null resource in Terraform re-runs a backup process after script changes, the most appropriate command is to use the option that specifies the replacement of that particular resource. Utilizing the -replace flag with the terraform apply command allows Terraform to recreate the specified resource. In this case, by issuing terraform apply -replace="nullresource.backupdatabase", Terraform understands that the null resource should be destroyed and then recreated, which effectively triggers the execution of the associated provisioners or scripts that handle the backup process.

This command is particularly useful when there are updates or changes to the associated scripts or configurations. By forcing Terraform to replace the resource rather than merely updating its configuration, it ensures that the resource re-runs its entire lifecycle, including any provisioners defined.

In contrast, other options do not achieve the desired outcome of rerunning the backup process. The terraform apply -target=nullresource.backupdatabase command would apply changes only to that specific resource, but it would not guarantee that it will rerun if no configuration changes were detected. The terraform validate nullresource.backupdatabase is used for validating the configuration but does not execute any processes or affect the state of resources. Meanwhile, `terraform plan -