Answer:
The correct answer is letter "C": alert when corrective action is needed.
Step-by-step explanation:
Statistical Process Control or SPC is a method useful to rate quality control as long as the object studied -called the conforming product- can be measured. The objective of SPC is to find improvement areas in the conforming product using for that purpose run and control charts. Though, SPC is not helpful while trying to fix quality issues -if any is found- with the use of those charts but to spot them only.