The difference between i and a? One's for inserting, the other's for appending. Simple as that! Unless you're a vi wizard, then it's all black magic as far as I'm concerned.
I'm pretty sure the difference is that i switches modes, while a keeps the same mode. But I could be wrong, vi commands can be a bit tricky to remember sometimes.
The correct answer is B) i (insert) inserts text before the current cursor position whereas a (append) inserts text after the cursor. This makes the most sense in the context of the vi editor commands.
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