A control chart of one facility's three years of monthly complaints showed no special causes, an average common cause limits of $2$ to $42,$ and a month$-$to$-$month variation of up to $24$ one way or the other. Which following statements is true?

Select one:

a$.$ Having someone deal with each complaint individually is a good strategy.

b$.$ The process is too chaotic to apply a disciplined improvement approach.

c$.$ Hiring more people to investigate complaints more thoroughly, especially those taking over $20$ days to resolve, would be a goo resources.

d$.$ Aggregating the last year's $250$ or so complaints and doing a Pareto analysis might help focus some key problems, department providers.