Which of the following is an object that manages a memory—based data buffer in Grand Central Dispatch (GCD)?

Which event of the Apple Pay JS framework defines the attributes contained by the onshippingmethodselected callback function?

Which CodeDate classes maintains a small connection pool for allowing concurrent database operations for NSSOLiteStoreType persistent stores?

Which SiriKit components is a type of protocol?

Which Trigger class objects indicates that a notif‌ication was sent by the Apple Push Notification Service?

Which is a new key for the info.plist file introduced in iOS 10?

What is the effect of using 'weak' in the following @property definition: @property (nonatomic, weak) SomeClass *responder; ?

Which is true?

The app is in the background but not executing code. What State App is it in?

This code doesn't do much, but which line will call the + (void)initialize method on the class SomeClass 1. - (void)doSomething 2. { 3. [SomeClass someClassMethod]; 4. SomeClass *obj = [[SomeClass alloc] init]; 5. NSString *descriptionString = [obj getNewString]; 6. }

An object with at least one owner can be destroyed.