As you can imagine, the camera moves forward to get the lens closer to the subject. When you experiment with a camera, the closer you are to the subject, the larger the subject in the viewfinder and the smaller the shooting range, which is in line with "from whole body to half body". Then, if you use a zoom lens, you push the focus of the lens forward. Similarly, the subject is getting bigger and the shooting range is getting smaller. The lens moves forward, which is equivalent to the camera box moving backward.

So it's d.