Which of the following commands will reduce all consecutive spaces down to a single space?

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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 ‘ ‘ ‘
‘ < a.txt > b.txt
E . tr -s ‘ ‘ < a.txt > b.txt

Answer: E