In developing an ET program, which three factors need to be considered?
1) Auto-pacing, level of interactivity, and level of sophistication of the trainees
2) Self-pacing, level of interactivity, and level of sophistication of the multimedia
3) Self-pacing, level of interactivity, and level of sophistication of the programmer
4) Auto-pacing, level of interactivity, and level of sophistication of the multimedia age