Which of the Following Does NOT Apply to Interstitial Ads

Multiple Choice

Which of the following does NOT apply to interstitial ads?

A) They present rich HTML5 experiences or web applications.
B) They are usually placed between transition points within or while entering or exiting a mobile application.
C) They are used to complete an in-app billing transaction to communicate with the server.
D) They are usually rendered as full screen or big popup. Some of them render videos, images or other rich content.