Which of the following is$/$are true about User$-$based and Item$-$based Collaborative filtering?

$(1)$ In Item$-$based Collaborative filtering, a user$$s rating for a particular item depends more on a user similar to him$/$her$.$

$(2)$ In User$-$based Collaborative filtering, a user$$s rating for a particular item depends more on the items similar to that particular item.

$(3)$ User$-$based Collaborative filtering is computationally more expensive $($in the sense that computations are done online and not offline$)$ than Item$-$based Collaborative filtering because usually in an Organization there are much more users as compared to the number of items$/$products$.$