Supernormal growth is a growth rate that:

A、isbothpositiveandfollowsayearormoreofnegativegrowth.
B、exceedsafirm'spreviousyear'srateofgrowth.
C、isgenerallyconstantforaninfiniteperiodoftime.
D、isunsustainableoverthelongterm.
E、appliestoasingle,abnormalyear.