The token auth method is foundational to Vault. The Vault documentation states:
"Tokens are the core method for authentication within Vault. It is also the only auth method that cannot be disabled. If you’ve gone through the getting started guide, you probably noticed that vault server -dev (or vault operator init for a non-dev server) outputs an initial 'root token.' This is the first method of authentication for Vault. All external authentication mechanisms, such as GitHub, mapdown to dynamically created tokens."
—Vault Concepts: Tokens
A,B,C: Correct per the above.
D: Incorrect; tokens can be used directly:
"Tokens can be used directly or auth methods can be used to dynamically generate tokens based on external identities."
—Vault Concepts: Tokens
[References:, Vault Concepts: Tokens, ]
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