CAN SOMEONE PLEASE HELP ME WITH THIS PLEASE ?

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

State 7 common key's for every keyboard

According to the video what are some tasks petroleum engineers perform check all that apply