Determine whether Relation $R$ is reflexive, symmetric and transitive: Relation $R$ in the set $Z$ of all integers defined as $R=\{(x,y):x-y \;\; \text {is an integer}\}$

Question

$\begin{array}{1 1} \text{Reflexive, Transitive and Symmetric} \\ \text{Neither Reflexive, Transitive nor Symmetric} \\ \text{Only Reflexive} \\ \text{Only Reflexive and Transitive}\end{array} $