A team of six sigma has reached the control stage of DMAIC. They have successfully reduced fabric critical stains from $73$ to $1$ per fabric roll. Now what type of control chart should the team recommend?

SELECT THE CORRECT ANSWER

A control chart based on the normal distribution such as the X$-$bar chart

A control chart based on the Poisson distribution such as the u chart

A p chart based on the binomial distribution

An np chart based on the binomial distribution