Which of the following is a community supported, open source OS used for both services and workstations?

A company has hired a new IT firm to manage its network switches and routers.
The firm is geographically separated from the company and will need to able to securely access the
devices.
Which of the following will provide the ability to access these devices?

Joe, a user, calls the help desk from a coffee shop while on a business trip to report the WiFi hotspot on his phone is extremely slow. The technician runs a speed test from a laptop connected to the hotspot and gets
200Kbps. Ann, Joe's coworker with whom he is travelling, also has a hotspot on her phone, and the speed test result on that hotspot is 15Mbps. The technician checks the hotspot settings on Joe's phone and sees the following:

Which of the following is the MOST likely cause of the problem?

A technician is in the process of upgrading Windows 8 to Windows 10. The technician needs to make sure all of the applications, user profiles, documents, and PST files are preserved. Which of the following methods would the technician MOST likely perform on the computer?

A user's smartphone takes longer to access websites than it did prior to a weeklong vacation. The user also observes the smartphone no longer says LTE in the corner of the screen, but it has significant improvements in speed when connected to a local hot-spot. Which of the following is the cause of the symptoms the smartphone is experiencing?