18: b format
20: b ctrl + and left mouse button
It would be better if we could see the options, fully. But from what I can see, it should be B.
Yes but if the hard drive stops working you will lose your files so it's better to backup your files to a cloud like iCloud by Apple.
Answer:
NOT mobile app. NOT Cloud-based app.
Explanation:
To speed up item insertion and deletion in a data set, use B. linked lists.
Hope this helps!
