Which of the following is a solution to a short$-$term staffing issue?

U$.$S$.-$based employees assigned to Europe to cover for employees on maternity leave.

Belgian$-$based employees assigned to oversee the local recruitment, selection, and onboarding of local employees for one year.

Canadian$-$based employees that work in the U$.$S$.$ during the week.

Norwegian$-$based employee who provides training to Australian employees.