B. Create a Lightning component that performs the HTTP REST callout, and use a Lightning Action to expose the component on the Opportunity detail page.

• This method leverages Lightning components and actions to provide a seamless user experience in the Lightning interface.
• Users can initiate the callout by interacting with the Lightning component, which can be designed to perform the HTTP REST callout.

C. Create an after update trigger on the Opportunity object that calls a helper method using @Future(Callout=true) to perform the HTTP REST callout.

• This method allows for asynchronous processing of the callout to avoid hitting governor limits during the transaction.
• The @Future annotation with Callout=true enables the method to perform callouts to external services after the Opportunity record is updated.

B , C