Imagine we have the data frame below and we have named it $"$df$"$ in R$.$ Which code below would calculate the average wage for workers in CA$?$df$\_$small$\_$quiz$6.$pngGroup of answer choicesmean$($df$wage$[$df$state$=="$CA$"])$sum df$wage if df$state$=="$CA$"$mean df$wage if df$state$=="$CA$"$sum$($df$wage$[$df$state$=="$CA$"])$