Anyone know what this Mark on my computer could be? Not sure how it got there

The salespeople at hyperactive media sales all use laptop computers so they can take data with them on the road. you are a salesperson for superduper lightspeed computers talking to hyperactive media sales about upgrading the laptops to windows 10. explain how network location awareness in windows 10 would make the laptops more secure.

What key should you press and hold to select and open multiple files at one time? enter alt control esc

Explain how email technologies enable the exchange of messages between users. find out the typical parts of an email address and explain each part.