[comprev]

"ls" shows only visible files whereas "ls -a" also displays those starting with a dot. Given the question doesn't that make your answer the correct one?

[zenoprax]

`la -A` will also show hidden files but excludes the "." and ".."

I prefer that way in theory but a capital "A" is not as quick/easy to type.

[derrida]

It accepts ls -a as and answer and ls -l but not ls -al