Which Unity model configuration should be recommended?

Using customer-supplied information, you have designed a solution using a Dell EMC Unity 400F with 250 drives. The customer now wants to increase the drive count to 340 drives at the lowest cost.

Which Unity model configuration should be recommended?
A . Keep the Unity 400F and add two 80-drive DAEs
B . Keep the Unity 400F and add four 25-drive DAEs
C . Upgrade to a Unity 500F and add two 80-drive DAEs
D . Upgrade to a Unity 500F and add two 25-drive DAEs

Answer: A