You have multiple Vault clusters in your environment, one for test and one for production. You have the CLI installed on your local machine and need…

Comprehensive and Detailed In-Depth

The VAULT_ADDR variable specifies the target Vault server. The Vault documentation states:

"VAULT_ADDR is the environment variable that is used to specify the address of the Vault server

expressed as a URL and port, for example: https://vault.bryankrausen.com:8200/. You can easily

modify the value of the environment variable whenever you want to target a different Vault

node/cluster."

— Vault Environment Variables

C: Correct. Sets the production cluster address:

"Setting the VAULT_ADDR environment variable allows you to specify the address of the Vault server

you want to target."

— Vault Environment Variables

A, B, D: Incorrect; unrelated to CLI targeting.

Reference:

Vault Environment Variables