Which of the following measures can be used to evaluate suppliers' performance in terms of quality?

a. percentage reduction in price of materials supplied

b. percentage of orders rejected due to defective materials

c. achievement of quality certification such as ISO 9000

d. percentage of orders delivered on time

e. supplier satisfaction survey results

f. implementation of team structures

b, c, and f

b and c

a and e

c, d, and e

c and d