Until recently, good PC software for producing digital videos was not available, but was much in demand by businesses. The first companies to produce a specific type of program had good sales even though they did little promotion and their programs were not "user-friendly." It seems that many of these "innovators" operated as if they were in the:
A. simple trade era.
B. Marketing department era.
C. sales era.
D. marketing company era.
E. production era.
Answer: production era.