Which command would replace “bob” with “Bob” in all instances and generate a new letter for printing?

You have created a really long letter and after you are done you notice that you used the name “Bob” many times but you forgot to capitalize it in many instances. Which command would replace “bob” with “Bob” in all instances and generate a new letter for printing?

A.
sed ‘s/bob/Bob’ letter > newletter

B.
sed ‘/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

Explanation:
sed is called the stream editor command, which is used to find and replace the string pattern.

Example:
#sed ‘s/cat/dog/’ testfile >testfilel: Which replace the cat to dog from testfile and redirect the output into testfi lei file.