Answer:
The first one. Important notice sum should be equal to zero before calculating the total sum.
One technical issue I had was on Windows 8.1, with the charm menu not working. The troubleshooting steps to fix it was I did CTRL+SHIFT+ESC to open task manager. I then found Windows Explorer and clicked "Reload." Then everything was fine.
Hope This Helped!
Answer is C
Braine list please:)