What sort of people lived in the forbidden city?

The Forbidden City was the political and ritual center of China for over 500 years. After its completion in 1420, the Forbidden City was home to 24 emperors, their families and servants during the Ming (1368–1644) and the Qing (1644–1911) dynasties.

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering

c. free trade can lead to low pay for workers in poorer countries.