Answer: A. Usability testing
Explanation:
Usability testing would be the correct answer because if the user interface isn't "frendly" then people won't be able to use it properly. Or if you are refering to the word friendly as looking safe, then even more so would be usability testing. Because if people don't like the fonts and styles of the user interface, they might not use it at all.
The first thing you will have to do is install it and then install windows through the bios
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Answer:
B) (x<=1)
Explanation:
Though this code given will run perfectly without any requirement of base case.But still we have to include a base case I will suggest (x<=1) because the value of x is decreased by one at each recursive call so it can handle it very well and it can handle negative values of x also if user enters it by mistake since factorial is for positive numbers only.