${?}_{{?}_{{?}_{?}}{?}_{{?}_{?}}\text{r}\text{e}\text{f}\text{e}\text{r}to\text{u}\text{n}\text{o}\text{f}\text{f}\text{i}\text{c}\text{i}\text{a}\text{l}\text{r}\text{e}\text{l}\text{a}\text{t}\text{i}\text{o}\text{n}\text{s}\text{h}\text{i}\text{p}\text{s}\text{s}\text{u}\text{c}\text{h}as\text{p}\text{e}\text{r}\text{s}\text{o}\text{n}\text{a}\text{l}\text{f}\text{r}\text{i}\text{e}\text{n}\text{d}\text{s}\text{h}\text{i}\text{p}\text{s}\text{,}\text{r}\text{i}\text{v}\text{a}\text{l}\text{r}\text{i}\text{e}\text{s}\text{,}\text{a}\text{n}\text{d}\text{p}\text{o}\text{l}\text{i}\text{t}\text{i}\text{c}\text{s}\text{.}}$

Question $25$ options:

Horizontal linkages

Lateral linkages

Informal linkages

Vertical linkages

Lateral divisions