Answer:
They were most likely engaged in "classroom training and lectures."
Explanation:
Classroom training method involves a facilitator passing across knowledge or information to a group of employees at the same time. The main advantage of this training method is that many employees can learn at the same time.
As the employees were hired by Ford to work in various departments, with different job functions, then it is most likely that on their first day at work, they were put through a "classroom training".
This is further buttressed by the the statement that all twenty of the employees received the same orientation and attended the same training and development sessions in one day and at the same time.