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Which method of account authentication does OAuth 2.0 use within REST APIs?
Correct Answer: B
The most common implementations of OAuth (OAuth 2.0) use one or both of these tokens: + access token: sent like an API key, it allows the application to access a user's data; optionally, access tokens can expire. + refresh token: optionally part of an OAuth flow, refresh tokens retrieve a new access token if they have expired. OAuth2 combines Authentication and Authorization to allow more sophisticated scope and validity control.