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.

A category is a group of related methods for a class, and all of the methods defined in a category are available through the class as if they were defined in the main interface file.

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?

What is a SEL?