A small grayscale image is 5 pixels tall and 8 pixels wide. All five rows are identical:
| column | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|
| value | 20 | 20 | 220 | 20 | 20 | 20 | 120 | 120 |
So the picture is a dim background with a thin bright stripe, one pixel wide, running down column 3 — and a step up to a medium grey from column 7 onwards.
The vertical-edge filter is slid across it:
| c1 | c2 | c3 | |
|---|---|---|---|
| r1 | -1 | 0 | 1 |
| r2 | -1 | 0 | 1 |
| r3 | -1 | 0 | 1 |
The window moves one pixel at a time, left to right and top to bottom, and only stops where it fits entirely inside the image — no border is added. The first stop covers image columns 1–3 and fills column 1 of the feature map; each step to the right fills the next column.
Because every row of the image is the same, every row of the feature map comes out the same too.
Which of these is that row, from the feature map's first column to its last?
Select all that apply.