At the Beginning of a Training Session, a Trainer Instructed

At the beginning of a training session, a trainer instructed the learners to use Brand X computers because the instructional design assumes Brand X computers. Many learners objected. They felt that since they will be using Brand Y computers at work, they should work on Brand Y computers in the room. If the instructor needs to use Brand X computers to instruct, which of the following is the MOST appropriate way to respond to the learners' need to be able to apply course materials to job requirements?

A) First explain to the class how the materials apply to Brand X. and then do the same for Brand Y.
B) Do not mention either brand by name, but refer learners to the manual covering each of the respective brands.
C) Provide a guide that relates Brand X to Brand Y computer functions
D) After providing the planned instruction on the Brand X computers, discuss differences that Brand Y computers present to the user.