Based on Davis and Venkatesh's Longitudinal Field Experiments, Feedback from Whom

Multiple Choice

Based on Davis and Venkatesh's longitudinal field experiments, feedback from whom can best estimate the hands-on usefulness of a system in its early implementation stage?

A) target users that know nothing about the system to be designed;
B) whoever (including target users and anyone else) that has no knowledge about what is being designed;
C) system developers
D) target users that receive information about a system's functionality without direct hands-on experience;
E) target users that have knowledge about a system's functionality and direct hands-on experience through training.