What is no man's land

No Mans Land was the stretch of land between 2 warring countries during WWI. It was the most dangerous stretch of land on the battlefront, and was often full of barbed wire and land mines.

Explanation:

https://spartacus-educational.com/FWWnoman.htm

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 correct answer is: the fact that the anti-federalist papers were considered poorly written.