c$)(5$ pts$)$ Let R $($A$,$B$,$C$,$D$)$ be a relation with attribute A as its primary key. Let $|$R$|$ be the

number of tuples in R$.$ Consider the following query:

Select D$,$ Min$($C$)$

From R

Group by D

It is known that there are $20$ different values for attribute D$,$ and than $90\%$ of the values

of C a greater than $21.$ What is the number of values that this SQL can return?

I. $20$

II$.18$

III. $2$

IV$.0$

V$.$ Cannot be determined