How would you add Number of items sold?

There is a logical fact table that contains Item number, store, time, and revenue. How would you
add Number of items sold?

A.
By creating a derived measure on the logical column Item number and using the count Function

B.
By creating a derived measure on the logical column item number and using the count distinct
function

C.
By creating a derived measure based on the physical column item number and changing the
aggregation method to count

D.
By creating a derived metric by using the Expression Builder

Explanation:
You should use a logical column (not physical). In fact,in the Explanation of the
exam, it displays a logical column.