Suppose a customer requires $3-$sigma capability, and you found Cp $=1\mathrm{.}89$ and Cpk $=0\mathrm{.}82.$ Which of the following can you conclude?

a$.$The process is not capable of meeting the customer$$s spec; Process centeredness needs to be addressed

b$.$ The process is not capable of meeting the customer$$s spec; Process variability needs to be addressed

c$.$ The process is capable of meeting the customer$$s spec; Neither centeredness nor variability need to be addressed

d$.$ The process is capable of meeting the customer$$s spec, centeredness needs to be addressed

e$.$ The process is not capable of meeting the customer$$s spec, but further investigation is needed to determine whether centeredness or variability need to be addressed