What is the difference between point$-$of$-$view shots and eye$-$line matches?

a$)$ Point$-$of$-$view shots necessarily involve characters, whereas eye$-$line matches do not.

b$)$ Point$-$of$-$view shots include shots that show us what a character is looking at from his approximate position, whereas eye$-$line matches join two comparatively objective shots.

c$)$ Point$-$of$-$view shots show what a character is looking at$,$ whereas eye$-$line matches do not.

d$)$ Point$-$of$-$view shots include reaction shots of a character, whereas eye$-$line matches do not.