What does the following code do?
PROC UNIVARIATE DATA = sashelp.cars;CLASS origin;VAR enginesize cylinders;RUN;
a. Create summary statistics for the enginesize and cylinders variables across the entire dataset.
b. Create summary statistics for the enginesize and cylinders variables for each subgroup of the origin variable.
c. Create summary statistics for the enginesize for each subgroup of the origin and cylinders variables.
d. Create summary statistics for the origin variable for each subgroup of the enginesize and cylinders variables.