Which of the following code examples has valid syntax and should execute properly?

data mycars;

set sashelp.cars;

AvgMPG$=$mean$($mpg$\_$city, mpg$\_$highway$)$;

run;

daat mycars;

set sashelp.cars;

AvgMPG$=$mean$($mpg$\_$city, mpg$\_$highway$)$;

run;

DATA mycars

SET sashelp.cars;

AvgMPG$=$MEAN$($mpg$\_$city, mpg$\_$highway$)$;

RUN;

DATA mycars;

SET sashelp.cars;

AvgMPG$=$MEAN$($mpg$\_$city, mpg$\_$highway$)$;