Which of the following elements of the factor weighting technique in supplier selection analysis does NOT contain a certain degree of subjectivity?

Question $16$ options:

a$)$

the numerical scale used to rate suppliers

b$)$

the weights applied to each supplier criterion

c$)$

the set of supplier criteria

d$)$

the scores for each potential supplier on each criterion

e$)$

the formula used to calculate the total weighted score for each supplier