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 REST Web Service
B . Apex SOAP Web Service
C . Apex SOAP Callout
D . Apex REST Callout

Answer: A