Which of the following is NOT a format that is used for digital audio?

MP4
Avi
Vob (Video object)
PNG

The head restraint should be adjusted so that it reaches a.the top of your ears b.the base of your skull c.the top of the head

Michael has written an e-mail to his employees that describes a new product special that will be introduced to the customers next week. by taking time to make sure the e-mail is well written, logical, and organized, michael has made sure his message has the characteristics of a) effective communicationb) ineffective communicationc) barriers to communicationd) workplace communication

Does anyone have the problem where you try to watch a video to get your answer but it brings up a thing asking your gender to make ads relevant but it doesn't load? btw i won't be able to see the answer so use the comments .