フリー問題

問題文

An integration runs on a back-end server with no user present. Which body does it post to the token route of the authentication base address?

選択肢

1. A grant type of client credentials together with the client identifier and the client secret that the installed package issued.
2. A grant type of password together with the account user name and the login password that the administrator issued.
3. A grant type of authorization code together with the client identifier and the redirect address that the installed package issued.
4. A grant type of refresh token together with the client identifier and the previous access token that the authentication service issued.