The Objective-C code ... @interface MyClass : NSObject<Sample> ... @end

Which one is NOT correct about Protocols ?

In which situation you would NOT use void types?

The following Objective-C code defines

When the above code is compiled and executed, it produces the following result:

Considering best practices of memory management in Objective-C, is it correct to say that the delegate is never retained ?

What are the two types of predicates?

What is a persistent object store?

What is the difference between #import and #include ?

True or False? You can perform operator overloading in Objective-C.

The proper typedef syntax for an Objective-C block that takes an NSArray and returns an NSString is