${?}_{{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{i}nanE-R\text{d}\text{i}\text{a}\text{g}\text{r}\text{a}\text{m}\text{r}\text{e}\text{f}\text{e}\text{r}to\text{t}\text{h}\text{e}\text{l}\text{e}\text{a}\text{s}\text{t}\text{n}\text{u}\text{m}\text{b}\text{e}\text{r}of\text{e}\text{n}\text{t}\text{i}\text{t}\text{i}\text{e}\text{s}\text{r}\text{e}\text{q}\text{u}\text{i}\text{r}\text{e}\text{d}in\text{a}\text{r}\text{e}\text{l}\text{a}\text{t}\text{i}\text{o}\text{n}\text{s}\text{h}\text{i}\text{p}\text{.}}$

Group $of$ answer choices

One$-to-$one relationships

Primary keys

Foreign keys

Minimum cardinalities