How Do Input-Based Definitions of High-Tech Differ from Output-Based Definitions

How do input-based definitions of high-tech differ from output-Based definitions?

A) Input-based definitions are based on expert's input/opinion while output-based definitions are based on the type of product sold.
B) Input-based definitions are post-hoc and output-based definitions omit some important new industries.
C) Both input-based and output-based definitions provide solid ranking of high-technology industries.
D) Input-based definitions are based on criteria such as the number of technical employees while output-based definitions are based on whether the product embodies leading-eduge technologies.
E) Input-based definitions tend to be preferred to output based definition.