Which of the following contains the INCORRECT definition of a preprocessor directive ?

In (...), the system uses the same reference counting system as (...), but it inserts the appropriate memory management method calls for us at compile-time.

Which one contains the INCORRECT definition of a Predefined Macro ?

What's the hierarchy of UIButton until NSObject ?

(...) are used by Cocoa and Cocoa Touch objects for a variety of different situations

If you start a class definition that conforms to a specified (...), you will not need to relist all the methods you will implement for that protocol in the @interface section.

What is #import?

Which of the following creates a class that conforms to a protocol?

Can an exception caught in @catch be re-thrown?

What class specifiers are supported?

Output of the following code?