Q27 Single choice Mark for later Which of the following commands will reduce all consecutive spaces down to a single space? A tr '\s' ' ' < a.txt > b.txt B tr -c ' ' < a.txt > b.txt C tr -d ' ' < a.txt > b.txt D tr -r ' ' '\n' < a.txt > b.txt E tr -s ' ' < a.txt > b.txt Correct answer