The Ixazyiquo tribe are believed to be one of the few remaining tribes in the country of Malugiato to have never had any contact with the Lamandians, settlers who arrived in Malugiain during the last hundred years. Using satellite imagery, a team of anthropologists determined that the Ixazyiquo land is covered with thriving banana plantations. The anthropologists conclude that the Ixazyiquo tribe has in fact had direct contact with the Lamandians. Which of the following, if true, would best support the anthropologists' conclusion? ['There is no standard shape to the Ixazyiquobanana plantations, which have taken on a form that best fits the soil conditions.', 'The Ixazyiquo are a hunter-gather society, which travel over vast areas of land to hunt.', 'Maintaining banana plantations requires sophisticated knowledge that only the Lamadians possess.', 'The Ixazyiquo have had extensive contact with the Wamalami, who have had direct contact with the Lamandians.']