Until recently, good PC software for producing digital videos was not available, but was much in demand by business. The first companies to produce a specific type of program had products that were advanced but were not user$-$friendly. It seems that many of these innovators operated as if they were in the:

Select one:

a$.$

simple trade era

b$.$

marketing concept era

c$.$

sales era

d$.$

engineering$/$product era

e$.$

societal marketing era