Which of the following statements indicates that training is$$ effective?

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Part $1$

A$.$

Customer complaints decline after training on strategic planning.

B$.$

The participants discuss the training with their peers who did not attend.

C$.$

A$$ company's shippable production increases following training on work instructions.

D$.$

Sales increase following training on paperwork reduction.

E$.$

The trainer received favorable reviews from the participants.