Question: Below are previews of DataFrames df$1$and df$2.$Which is not tidy and why? $$ df$1.$head$()$ Ozone Solar.R Month Day $041\mathrm{.}0190\mathrm{.}051136\mathrm{.}0118\mathrm{.}052212\mathrm{.}0149\mathrm{.}053318\mathrm{.}0313\mathrm{.}0544$ NaN NaN $55...$df$2.$head$()$ Ozone Day variable

Below are previews of DataFrames df

$1$

$$and df

$2$

$.$

$$Which is not tidy and why?

$$ df

$1$

$.$

head

$($

$)$

$$ Ozone Solar.R Month Day

$0$

$4$

$1$

$.$

$0$

$1$

$9$

$0$

$.$

$0$

$5$

$1$

$$

$1$

$3$

$6$

$.$

$0$

$1$

$1$

$8$

$.$

$0$

$5$

$2$

$2$

$1$

$2$

$.$

$0$

$1$

$4$

$9$

$.$

$0$

$5$

$3$

$$

$3$

$1$

$8$

$.$

$0$

$3$

$1$

$3$

$.$

$0$

$5$

$4$

$$

$4$

$$ NaN NaN

$5$

$5$

$$

$.$

$.$

$.$

df

$2$

$.$

head

$($

$)$

$$ Ozone Day variable value

$0$

$5$

$1$

$$ Ozone

$4$

$1$

$.$

$0$

$1$

$5$

$2$

$$ Ozone

$3$

$6$

$.$

$0$

$2$

$5$

$3$

$$ Ozone

$1$

$2$

$.$

$0$

$3$

$5$

$4$

$$ Ozone

$1$

$8$

$.$

$0$

$4$

$5$

$5$

$$ Ozone NaN

$.$

$.$

$.$

$$

df

$2$

; The rows are not all separate observations.

df

$1$

; The rows are not all separate observations.

df

$1$

; Each variable is not a separate column.

df

$2$

; Each variable is not a separate column