During the quality control process, you are reviewing a chart which has many limits such as upper control limit, lower control limit, upper specification limit, and lower specification limit. While observing chart, you notice that a parameter of a specimen is outside of specification limits, so you ask a team member to replace the specimen. How are the upper and lower control limits defined?

(a) Based on client’s input

(b) Based on 3 Sigma

(c) Based on 6 Sigma

(d) None of the above