The relation $R$ defined in $A=\{1,2,3\}$ by a $R$ b if $\left|a^2-b^2\right| \leq 5$. Which of the following is false
(A) $R=\{(1,2),(2,2),(3,3),(2,1),(2,3),(3,2)\}$
(B) Co-domain of $R=\{1,2,3\}$
(C) Domain of $R=\{1,2,3\}$
(D) Range of $R=\{1,2,3\}$