How should you create the Customer Name field and then access it using C/AL code?

You are designing a table with a Customer Name field that must not be stored. The table
must derive its contents from the Name field on the Customer table. The Customer Name
field must then be used in a C/AL function. How should you create the Customer Name field
and then access it using C/AL code?

A.
Create the Customer Name as a FlowFilter field. In the code, use the CALSUMS function
to evaluate the value of Customer Name.

B.
Create the Customer Name as a Normal text field. In the code, use the EVALUATE
function to evaluate the value of Customer Name.

C.
Create the Customer Name as a FlowField with a Method set to Lookup. In the code, use
the CALCFIELDS function to evaluate the value of the Customer Name.

D.
Create the Customer Name as a FlowFilter field. In the code, use the EVALUATE function
to evaluate the value of Customer Name.