Which term was used in the 1800s to refer to people who wanted slavery to end?   a. abolitionists   b. masters   c. servants   d. constructionists

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering

d. hip hop

it was originated in the 70s while the harlem renaissance occured in the 1920s