$12.$ For the process to be capable of meeting design specifications, the process capability index must be Ans$\_\_\_\_\_$

a$)$ less than one $(1\mathrm{.}0).$

b$)$ equal to or greater than one $(1\mathrm{.}0).$

c$)$ less than zero $(0\mathrm{.}0).$

d$)$ equal to or greater than zero $(0\mathrm{.}0).$