Which WHERE expression completes the program and generates the desired output?

Given the SAS dataset ONE

ONE

SALARY

200

205

523

The following SAS program is submitted

Proc sql;

Select * from one

<Insert Where expression here>;

quit;

The following output is desired:

SALARY

200

205

523

Which WHERE expression completes the program and generates the desired output?
A . Where salary is not
B . Where salary ne null
C . Where salary is not missing
D . Where salary ne missing