None of them are wrong. If this is a test of ones ability in English it's not a very good one.
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AngliholicThanks, Huevos and Khoff."sitting at a keyboard" can imply sitting in front of a computer, but not necessarily. There are a lot of
Yes, I see eye to eye with you.
And the given answer is "keyboard." To make sure, does "sitting at a keyboard" imply "sitting before/at a computer?" Is it also right to say "sitting before a keyboard?"
khoffand "bar" is the least likelyI don't see a problem with it at all. It's just like sitting at the table, though some might say sitting by the bar.