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Answer Posted / Shobha Kumari
In Objective-C, there are three main types of protocols: (1) Protocols with methods declaration only - these define a set of methods that a class must implement. (2) Protocols with methods implementation - these are also known as C categories and provide method implementation for Objective-C classes. (3) Delegation protocols - these define a protocol to be followed by an object to handle events or messages from another object.
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