Which solution is recommended in order to meet the requirement?

Northern TrailOutfitters (NTO) has an affiliate company that would like immediate notifications of changes to opportunities in the NTO Salesforce instance. The affiliate company has a CometD client available.

Which solution is recommended in order to meet the requirement?
A . Create a connected app in the affiliate org and select the "Accept CometD API Requests".
B. A Implement a polling mechanism in the client that calls the SOAP API getupdated method to get the ID values of each updated record.
C. Configure External Services to call the subscriber in Apex in the Onchange Trigger event as part of the flow.
D. Create a PushTopic update event on the Opportunity Object to allow the subscriber to react to the streaming API.

Answer: D