Which command will delete all the blank lines in file old.txt?

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Question:Which command will delete all the blank lines in file old.txt?

1.sed ‘/d’ old.txt

2.sed ‘/^/d’ old.txt

3.sed ‘/^$/d’ old.txt

4.sed ‘/^*/d’ old.txt

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  1. Which command will delete all the blank lines in file old.txt?
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