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Objective C carries object-oriented and dynamic runtime features. This programming language is suitable for writing code for OS X and iOS. Plus, it has inherited flow control, primitive types, and syntax from the C programming language.
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Objective-C allows you to define protocols, which declare the methods expected to be used for a particular situation. Protocols are implemented in the classes conforming to the protocol. The methods under keyword (...) must be implemented in the classes that conform to the protocol and the methods under (...) keyword are optional to implement.
What is the name of the root class in Objective-C?