Which two data sets are permanent?

Which statement is true about the DROP statement during the compilation phase of the DATA step?

When the following code is submitted, execution fails.

Why does the execution fail?
Multiple executable statements are not allowed in the DO block.

Given the input data set INVENTORY as shown below:

Two output data sets are desired, CHIPS and OTHERSNACKS.
*The CHIPS data set should only include QtySold, Price, and Product.
*The OTHERSNACKS data set should include QtySold, Price, product, and Type.
Which Data step creates the two desired output data sets

Which PROC MEANS statements specifies variables to group the data before calculating statistics?