Julia Will Be Using a Smartphone for Business and Want

Multiple Choice

Julia will be using a smartphone for business and want to be courteous and responsible. What etiquette advice should you give her? 

A) Speak in low, conversational tones.
B) Don't text while driving, cycling, or walking down the sidewalk.
C) Don't step up to a service counter, such as at a restaurant, bank, or post office, while talking on her smartphone.
D) All of the above will help Julia be a courteous and responsible smartphone user.