Module $1$ Lecture $[$Link $($Construction Fatality Map Dashboard$)]$: On August $29$th of $2011,$ in Marietta, Ga$.,22$ year old male employee fell $40$ feet to his death, while working on the roof of a hanger. This worker was an employee of which of the following types of subcontractors?

a$)$ Steel erection

b$)$ Roofing

c$)$ Electrical

d$)$ Concrete