What is the difference between the audio mixer and meters panel.

An audio mixer can come in either analog or digital form Various styles of meters exist on mixers and for audio

answer is:

a). backstage view

explanation:

backstage view is the area where files and data about them is managed— creating, saving, printing, sending to others, inspecting for hidden metadata or personal information, and setting options. so in this way we can add many things to our document swiftly.

i hope you get the idea.