Which of the following are examples of a parallel changeover?

A toy manufacturer that has new assembly line staff working at the same time as the old staff before they move on to other roles.

A factory that wants to change from a manual to an automated system keeps on some of its manual labour employees whilst implementing the automated system.

A supermarket that updates all its checkouts while the store is closed.

A multi-storey hotel store that redecorates each level one-by-one, rather than all in one go.

A call centre that moves into its new office overnight, so that it is fully operational the next day.

A car manufacturer that trials a new type of automation before replacing the old system with it.