What is the effect of the REUSE=YES SAS system option?

The following SAS program is submitted:

options reuse=YES;

data sasuser RealEstate(compress=CHAR);

set sasuser houses;

run;

What is the effect of the REUSE=YES SAS system option?
A . It tracks and recycles free space
B . It allows a permanently stored SAS data set to be replaced
C . It allows users to access the same SAS data set concurrently
D . It allows updates in place