Which person illustrates the cross$-$training method?

Blanche, a cashier, is being trained to stock shelves in case there is a shortage of employees.

Jackson, along with his colleagues, participates in a $5K$ run sponsored by the company.

Roberta and five other managers analyze a business problem to suggest changes. Rachel reviews videos of other employees exhibiting certain important behaviors related to the workplace.

Jeremy has team members visualize what they have to do to release a new product.