15 points asap under the copyright laws what would be the life span of all the copyrighted material of a painter after his death 70 years after the death of the creator 20 years after the death of the creator permanent indeterminate

Over time, historians have changed the ways they study the past because they have: o a. emphasized the study of oral history passed down in communities for generations. o b. started to explore history through the perspectives of many different groups. c. focused on uncovering archaeological evidence rather than analyzing documents. d. largely abandoned studying comparative and cultural history in favor of microhistory.