If a technological advancement becomes available, the demand for $\_\_\_\_\_\_\_\_$ labor may decrease because the new tech may be viewed as a $\_\_\_\_\_\_\_.$

Question $2$ options:

a$)$

high$-$skill; complement

b$)$

low$-$skill; substitute

c$)$

high$-$skill; substitute

d$)$

low$-$skill; complement