On planet Vegas, they calculate with symbols. The rules for arithmetic operations are the same as in Slovenia. The teacher wrote the expression $(\exists+U)^{2}$ on the board. Which result is correct?
(A) $\exists^{2}+\bigcup^{2}$
(B) $\exists^{2}-\cup^{2}$
(C) $\exists^{2}+2 \exists \cup-U^{2}$
(D) $\exists^{2}+2 \exists \cup+\cup^{2}$
(E) $\exists^{2}-2 \exists \cup+\cup^{2}$
A4 $\operatorname{Expr}(\exists+U)^{2}$ we square according to the rule $(\exists+U)^{2}=\exists^{2}+2 \exists U+U^{2}$.