Choose the Letter That Best Describes the Output $x = 4$

Choose the letter that best describes the output. Assume that the code is applied to a computer monitor with a resolution of 1280 by 1024.
-For $x = 4$ to 1280 step 4
$y = 0.25 x + 512$
Plot pixel $( x , y )$
Next $x$

A) Consecutive points separated by 4 pixels
B) Upward-sloping line
C) Downward-sloping line
D) Horizontal line
E) None of these