It is about data analysis

the answer is 1.A -1

explain in detail, please

1. A latent-factor collaborative ltering model returned the following factorization of the utility matrix,

where rows represent users and columns represent items. What is the rating of item #2 (2nd column in

R, index starts at 1) by user #3 (3nd row in R, index starts at 1) predicted by this model?

A. -1

B. 0

C. 1

D. 2

E. 3

R=121230101110011112