Which OAuth URL parameter can be used to retain the original requested page so that a user can be redirected correctly after OAuth authorization?

Universal Containers (UC) built an integration for their employees to post, view, and vote for ideas in Salesforce from an internal Company portal. When ideas are posted in Salesforce, links to the ideas are created in the company portal pages as part of the integration process. The Company portal connects to Salesforce using OAuth. Everything is working fine, except when users click on links to existing ideas, they are always taken to the Ideas home page rather than the specific idea, after authorization .

Which OAuth URL parameter can be used to retain the original requested page so that a user can be redirected correctly after OAuth authorization?
A . Redirect_uri
B . State
C . Scope
D . Callback_uri

Answer: A