Which of the following commands replaces each occurrence of 'bob' in the file letter with 'Bob' and writes the result to the file newletter?

Which of the following commands replaces each occurrence of ‘bob’ in the file letter with ‘Bob’ and writes the result to the file newletter?

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Which of the following commands replaces each occurrence of ‘bob’ in the file letter with ‘Bob’ and writes the result to the file newletter?
A . sed ‘/bob/Bob’ letter > newletter
B . sed s/bob/Bob/ letter < newletter
C . sed ‘s/bob/Bob’ letter > newletter
D . sed ‘s/bob/Bob/g’ letter > newletter
E . sed ‘s/bob, Bob/’ letter > newletter

Answer: D