Which CAS action is used to calculate the sum, minimum, maximum, and mean for numeric variables in a CAS table?

Which CAS action is used to aggregate data at a higher level of granularity in a CAS table?

Given the CAS table casuser.shoes and the following SAS program:
data casuser.shoes2(where=(region="Africa" and Product="Slipper"));
set casuser.shoes;
keep Region Product Sales;
run;
Which statement is true?

Which CAS statement is used to load data from an external file into a CAS table?

What is the file extension used for SAS Viya programs?