How many binary digits does a single hexadecimal digit represent?

In which part of a professional email should you try to be brief, but highly descriptive?

Ingrid started speaking about her slide presentation. when she clicked to th"third slide, which had just a picture of an elephant, she forgot what she wassupposed to talk about. what could ingrid do to avoid this situation in thefuture? oa. print handouts for her audience.ob. add presenter's notes to each slide.oc. add a video to each slide.od. save her slide presentation to a flash drive

Why does the pc send out a broadcast arp prior