Below are four versions of the same dataset. Which one is in a tidy format?

state abb region population total

Alabama AL South $4779736135$

Alaska AK West $71023119$

Arizona AZ West $6392017232$

Arkansas AR South $291591893$

California CA West $372539561257$

Colorado CO West $502919665$

state abb region var people

Alabama AL South population $4779736$

Alabama AL South total $135$

Alaska AK West population $710231$

Alaska AK West total $19$

Arizona AZ West population $6392017$

Arizona AZ West total $232$

state abb Northeast South North Central West

Alabama AL NA $4779736$ NA NA

Alaska AK NA NA NA $710231$

Arizona AZ NA NA NA $6392017$

Arkansas AR NA $2915918$ NA NA

California CA NA NA NA $37253956$

Colorado CO NA NA NA $5029196$

state abb region rate

Alabama AL South $2\mathrm{.}82$e$-05$

Alaska AK West $2\mathrm{.}68$e$-05$

Arizona AZ West $3\mathrm{.}63$e$-05$

Arkansas AR South $3\mathrm{.}19$e$-05$

California CA West $3\mathrm{.}37$e$-05$

Colorado CO West $1\mathrm{.}29$e$-05$

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