Which statements about the copy protection (three copies) and EC technologies are correct?

Which statements about the copy protection (three copies) and EC technologies are correct?
A . The EC technology provides high durability and high utilization, and is more cost-effective.
B . The copy technology has higher computing requirements than the EC technology.
C . Reconstruction is simpler for the copy technology than it is for the EC technology.
D . The copy technology provides high durability, but the space utilization is low.

Answer: AC