Macro photographs are what type of photographs? close-up telephoto abstract all of the above

Which action is good business etiquette? a. switching your cell phone off before you enter a meeting b. keeping your cell phone on low volume before you enter a meeting c. setting a pleasant ring tone on your cell phone before you enter a meeting d. setting a standard ringtone on your cell phone before you enter a meeting

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What multimedia system creates an immersive, real-life experience that the user can interact with?