Which is the optimal method to implement this in Salesforce?

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A company has a native iOS app for placing orders that needs to connect to Salesforce to retrieve consolidated information from many different objects in a JSON format .

Which is the optimal method to implement this in Salesforce?
A . Apex SOAP Callout
B . Apex REST Callout
C . Apex SOAP Web Service
D . Apex REST Web Service

Answer: D