this is about data analysis

explain in detail,please

1.

Using the same notations as in the previous question, consider the following latent-factor

model of U:

How many latent factors are used in this model?

A. 0

B. 1

C. 2

D. 3

E. 4

F. 5

2.

What is the rating of item 0 (first row) by user 0 (first column) predicted by the model of

the previous question?

A. 0

B. 0.1

C. 0.2

D. 1

E. 2

model of U: M=00.10.2110.1[0.1200.10.10.2]