${?}_{{?}_{{?}_{?}}{?}_{{?}_{?}}is\text{a}\text{r}\text{e}\text{l}\text{a}\text{t}\text{i}\text{o}\text{n}\text{a}\text{l}\text{s}\text{e}\text{t}\text{o}\text{p}\text{e}\text{r}\text{a}\text{t}\text{o}\text{r}\text{.}}$

Question $28$Select one:

$a.$

EXCEPT

$b.$

PLUS

$c.$

ALL

$d.$

EXISTS