Which of the Following Is an Example of the Cross-Training

Which of the following is an example of the cross-training method?

A) Mary, who is a cashier, is being trained to stock shelves in case there is a shortage of employees.
B) Stan and his work colleagues take part in a rafting course sponsored by the company.
C) Jenna and 5 other managers are tasked to study a business problem and present recommendations.
D) Jenson is asked to review videos of other employees exhibiting certain important behaviors related to the workplace.
E) Katherine uses an online persona to make decisions in game simulations involving job-related situations.