"In its original form, Kirkpatrick model of training effectiveness evaluation suggests that "

Group of answer choices

a. "When possible, training should always be evaluated by training participants, trainers, managers, and independent specially-trained observers"

b. "Training should be evaluated at the levels of reactions, learning, behaviors, and results"

c. "Training should always be evaluated using objective tests, while subjective opinions should be avoided as they tend to yield invalid and unreliable data"

d. "While pre- and post-training assessment and use of control groups is unnecessary when measuring how much has been learned in a training/development session, these measurement approaches should always be utilized when measuring the impact of training on trainee behavior and performance. "

e. All of the above