${?}_{{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_B\text{l}\text{a}\text{n}\text{k}is\text{t}\text{h}\text{e}\text{p}\text{e}\text{r}\text{i}\text{o}\text{d}\text{d}\text{u}\text{r}\text{i}\text{n}\text{g}\text{w}\text{h}\text{i}\text{c}\text{h}\text{a}\text{c}\text{u}\text{s}\text{t}\text{o}\text{m}\text{e}\text{r}\text{i}\text{n}\text{t}\text{e}\text{r}\text{a}\text{c}\text{t}\text{s}in\text{a}\text{n}\text{y}\text{w}\text{a}\text{y}\text{w}\text{i}\text{t}\text{h}\text{a}\text{s}\text{e}\text{r}\text{v}\text{i}\text{c}\text{e}\text{p}\text{r}\text{o}\text{v}\text{i}\text{d}\text{e}\text{r}\text{.}}$

Group $of$ answer choices

Time $of$ service

Service encounter

Service period

Moment $of$ interaction

Service quality