One way in which knights, samurai, and warlords
are similar is that they all
(1) were traditional religious leaders
(2) occupied military posts in the chinese
empire
(3) expelled the moors from spain
(4) held positions of power in feudal systems

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering

the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.