I'm going to have to go with Option B. It's the only one that looks like it was actually written by someone who knows what they're doing in the Bourne shell.
Hmm, this is a tricky one. I'm leaning towards Option D, but I'm not totally sure. Maybe I should have paid more attention in my shell scripting class.
Option B looks like the correct if condition in the Bourne shell. The use of the double square brackets `[[` is a common way to test conditions in shell scripting.
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