Which of the following statements is not true ？（）
A．Attribute sampling is the process of assessing whether results conform to specifications or not
B．Prevention means keeping errors out of the process by applying actions before the process starts changing its input
C．Variables sampling means that the result is classified into one of the 3 categories: "acceptable"-"acceptable after rework" "rejected"
D．Inspection is often mainly done to keep errors out of the hands of the customer instead of as a means of process control
