A firm can $\_\_\_\_\_\_\_\_\_\_\_$ and $\_\_\_\_\_\_\_\_\_\_\_\_$ to improve its cash conversion cycle in a way that benefits the firm.

a$.$

lengthen its accounts payable period, increase its inventory turns

b$.$

lengthen its accounts payable period, decrease its inventory turns

c$.$

shorten its accounts payable period, increase its inventory turns

d$.$

shorten its accounts payable period, decrease its inventory turns