Think Critically $1-1$: Selecting a Windows $10$ Version for a Small Organization

Master Motors has $18$ computers. They are replaced only as necessary due to hardware failure or new software requirements. No server is in place to centrally manage resources or security and no plan exists to add one in the next three months. Master Motors may expand to two new locations in the next $12$ months. Two computers have recently failed and require replacement. The owner would like to also purchase three extra computers as spares and for possible expansion. Which version of Windows $10$ should be purchased with the new computers?