While solving a word problem involving the length of a ribbon, the equation x(x−5)=0 was obtained, where x is the length in cm. Which root must be rejected and why?
(a) 0\,cm, because length cannot be negative
(b) Neither root needs to be rejected, because both lengths are allowable
(c) 0\,cm, because length cannot be zero
(d) 5\,cm, because length cannot be zero