We have a dataframe that has the following data:

The code below was used to make the graph. There are $4$ missing pieces of the code. They

are represented by $??1??,??2??,??3??$ and $??4??.$ Please select the appropriate word:

$??1??$: xlim$,$ ylab, xlab, or ylim$?$

$??2??$: title, subtitle, ggsubtitle, or ggtitle?

$??3??$: coord$\_$flip$(),$ flip$\_$coord$(),$ coord$\_$fixed$(),$or fixed$\_$coord$()?$

$??4??$: minimal, bw$,$ blue, or classic?

ggplot$($x$1,$ aes$($X$=$Species, y$=$Value$))+$geom$\_$col$($fill$=$"lightblue", color$=$"darkblue"$)+??1??("$Frequency$")+??2??("$Number of Threatened Species in Australia"$)+??3??()+$theme$\_??4??()$