What are the names of all of the columns created by the TRANSPOSE procedure?

The SAS data set ONE contains the variables X,Y,Z and W.

The following SAS program is submitted:

Proc transpose data =one

Out=trans

Name=new;

By x;

var y;

run;

What are the names of all of the columns created by the TRANSPOSE procedure?
A . new, X, Y and _COL1_
B . new, X and COL1 only
C . new, Y and COL1 only
D . new, X and Y only