A data analyst is working with a data frame named stores. It has separate columns for city $($city$)$ and state $($state$).$ The analyst wants to combine the two columns into a single column named location, with the city and state separated by a comma. What code chunk lets the analyst create the location column?

$1$ point

unite$($stores$,$location$,$ city, state$)$

unite$($stores$,$location$,$ city, state, sep$=,)$

unite$($stores$,$ city, state, sep$=,)$

unite$($stores$,$location$,$ city, sep$=,)$