Determine which of the four levels of measurement (nominal, ordinal, interval, ratio)is most appropriate for the data .alert system of yellow (lowest),orange, and red (highest) choose the correct answer below.

a. the nominal level of measurement is most appropriate because tha data can not be ordered.

b. the ordinal level of measurement is most appropriate because the data can be ordered, but differences (obtained bysubtraction) can't be found meaningless.

c. the ratio level of measurement is most approriate because the data can be ordered. differences (obtained by subtraction) can be found and are meaningful, and there is a natural starting point.

d. the interval level of measurement is most appropriate because the data can be ordered, differences (obtained by subtraction) can be found and are meaningful, and there is no natural starting point.