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Mastering iOS 12 Programming
By :

a) About two minutes. b) There is no way to be sure. c) You have no time limit.
a) By requesting it in AppDelegate
.
b) By enabling the Background Refresh capability.
c) Both.
a) Your app will be woken up every time the interval passes. b) iOS will determine when it's the best time wake up your app. It will be no more often that you specify. c) iOS will ask your app whether it has any work to do when the interval passes.
a) To take work off the main thread. b) To be notified when all network calls were done. c) To make sure all network calls are fired at the same time.
a) When you get frustrated with your code. b) When you find strange bugs. c) Any time you think you can improve something.