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Relative path resolution

Using the filesystem diagram below, if pwd displays /Users/thing, what will ls ../backup display?

1. ../backup: No such file or directory
2. 2012-12-01 2013-01-08 2013-01-27
3. 2012-12-01/ 2013-01-08/ 2013-01-27/
4. original pnas_final pnas_sub

Please answer the question above and click on the statement that applies to you.

I am sure my answer (1., 2., 3. or 4.) is correct.

I am doubting if my answer is correct

I don’t know the answer