What is true about Grand Central Dispatch(GCD) and NSOperation?

Which will print the value of a Boolean flag in NSLog?

Which is not used to find an object contained in NSMutableArray?

Why does the error, 'EXC_BAD_ACCESS' occur?

Which changes the color of the pagination dots of UIPageControl?

Which will make an iPhone app return its own version number?

Which will get the position of UIView within the entire UIWindow?

How can an alert message/pop-up dialog box be shown in iOS?

Which compares NSString while ignoring case?

Which will create a singleton class that is compatible with ARC?

What will happen when the tableView:accessoryButtonTappedForRowWithIndexPath UITableViewDelegate method is called, in a case where there is a custom UIControl subclass in the standard accessory view?