Which of the following constitutes an eye$-$line match cut?

$$ a$)$ A shot of a character looking offscreen and then a shot of that character from another angle.

$$ b$)$ A shot of a character looking offscreen and then a shot of another character looking back at him.

$$ c$)$ A shot of a character looking offscreen and then a shot of the exterior of the location where that character is positioned.

$$ d$)$ A shot of a character looking offscreen and then a shot of another character also looking offscreen.