A. https://developer.amazon.com/en-US/docs/alexa/account-linking/requirements-account-linking.html
Your system must meet the following requirements:
OAuth – Your system must support OAuth 2.0.
Grant type – If your skill is a custom skill, your system must support the authorization code grant type or implicit grant type. Any other type of skill that supports account linking (for example, smart home skills) must support the authorization code grant type.
Sorry. C. For Smart Home. To implement account linking for smart home skills, you must have the following prerequisites:
Your system must support OAuth 2.0 and the authorization code grant type.
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