Given the SAS data set ONE:

ONE -

DIVISION SALES -

A 1234 -

A 3654 -

B 5678 -
The following SAS program is submitted:
Data_null_;
Set one;
By divition;

If first.division then -
Do;
%let mfirst=sales;
end;
run;
What is the value of the macro variable MFRIST when the program finishes execution?