Which of the following set of Unix commands will always display “WELCOME” ?

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Question:
Which of the following set of Unix commands will always display “WELCOME” ?

1.export title=WELCOME; Echo $title

2. title = WELCOME; export $ title ; sh –c “echo $title”

3.title = WELCOME; export title ; sh –c “echo $title”

4. title = WELCOME; echo $title

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