What should you use to construct the resource ID?

You plan to use Azure Resource Manager templates to perform multiple deployments of identically configured Azure virtual machines. The password for the administrator account of each deployment is stored as a secret in different Azure key vaults.
You need to identify a method to dynamically construct a resource ID that will designate the key vault containing the appropriate secret during each deployment. The name of the key vault and the name of the secret will be provided as inline parameters.
What should you use to construct the resource ID?
A. a key vault access policy
B. a linked template
C. a parameters file
D. an automation account

Correct Answer: C
Explanation/Reference:
Explanation:
You reference the key vault in the parameter file, not the template. The following image shows how the parameter file references the secret and passes that value to the template.

Reference:
https://docs.microsoft.com/en-us/azure/azure-resource-manager/resource-manager-keyvault-parameter