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

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

A) Olivia,a cashier,is being trained to stock shelves in case there is a shortage of employees.
B) Stan,along with his colleagues,participates in a 5K run sponsored by the company.
C) Kylie and five other managers analyze a business problem to suggest changes.
D) Patrick reviews videos of other employees exhibiting certain important behaviors related to the workplace.
E) Ira has team members visualize what they have to do to release a new product.