What is the difference between Cp and Cpk$?$

Select one:

a$.$

Cp is short term and Cpk is long term

b$.$

Cpk is $3*$Cp

c$.$

Cp ignores centring issues whilst Cpk includes centring issues

d$.$

Cp is for individual data and Cpk is for sampled data

e$.$

Cp assumes normality whilst Cpk does not assume normality