Industrial$-$goods can be classified in terms of how they enter the production process and their relative costliness$.$ We can distinguish three groups of industrial goods: $\_\_\_\_\_\_\_\_,$ capital items, and suppliers and business services.

Question $14$Select one:

a$.$

sub$-$assemblies

b$.$

materials and parts

c$.$

service components

d$.$

specialty goods

e$.$

pieces and parts