Considering the following Objective-c snippet, which of the following is NOT correct ?

#import <Foundation/Foundation.h> @interface SampleClass:NSObject - (void)sampleMethod; @end @implementation SampleClass - (void)sampleMethod{ NSLog(@"Hello, World! \n"); } @end int main() { /* my first program in Objective-C */ SampleClass *sampleClass = [[SampleClass alloc]init]; [sampleClass sampleMethod]; return 0; }

When an object's retainCount reaches 0, which message is automatically sent to that Object?

All of the methods in a (...) annotated with @required must be implemented.

Using object-oriented programming the object that sends a message

As categories can't have instance variables, what class could you use to implement a full class only with categories

If a is an integer, the expression !a (...)?

If you do not declare a return type for a method definition, what is the default return type?

In Core Data, what is the name of an object representation of a record?

What is one source of particles that are emitted by a CAEmitterLayer object?

What happens at runtime with the following: NSObject* object = nil; NSObject* object2 = [object copy]; NSLog(@"%@", object2);

Assume ARC is enabled... What would be another way to write this: NSArray *array = [NSArray arrayWithObjects:@"One", @"Two", @"Three",nil];