Which of the following commands will change all occurrences of dog in the file animals.txt to mutt in the screen display?

Which of the following commands will change all occurrences of dog in the file animals.txt to mutt in the screen display?
A . sed Cs “dog” “mutt” animals.txt
B . grep Cs “dog||mutt” animals.txt
C . sed ‘s/dog/mutt/g’ animals.txt
D . cat animals.txt | grep Cc “dog” “mutt”
E . fmt animals.txt | cut ‘dog’ > ‘mutt’

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Answer: C