Select from options: Continue writing the next sentence.

How to find out which planes are flying overhead
Launch siri.
You can open siri by pressing and holding the home button on your iphone.
Wait for siri to ask what you'd like.

Choices:
(I) On most services, siri will ask you what you'd like by pressing and holding the home button, and siri will send you an sms asking you what you'd like to do. Scroll through the list of flights available to add them to your itinerary.
(II) Siri will enable the shared navigation, showing you the different airlines and their flights at different times. While some airlines allow siri to display all flights, some airlines only allow siri to display all destinations.
(III) By default, you'll be given the view screen. Otherwise, siri will allow you to read the information and select which planes are flying overhead.
(IV) You will see the message " what can i help you with? " on your screen. Ask siri what plane is flying overhead.
Answer:
(IV)