Stoddard Manufacturing makes buckles for car safety seat belts. The Management have decided to embrace Lean Thinking. The company has $800$ employees divided into $4$ major segments. At the moment they have $15$ Green Belts who have between $2-6$ months of experience. The first $10$ Green Belts attended public training sessions. Three months ago the company hired its first Black Belt who has trained up $5$ more on a company$-$specific syllabus.

The Quality Director is undertaking the role of Board Level Champion. At first this was not confirmed and the Quality Director had to struggle with other colleagues on the Board to gain commitment and buy$-$in to developing a Lean $6$ Sigma culture. However, that commitment and buy$-$in has now been established and, with one or two minor exceptions, the whole Board has given their support to this initiative.

According to the BOK, which one of the following best describes Stoddard's current maturity level?

Select one:

a$.$ M$1$

b$.$ M$1-$M$2$

c$.$ M$5$

d$.$ M$4-$M$5$

e$.$ M$3$