Which two statements about Fibre Channel Class 2 are true? (Choose two.)

A.
Fibre Channel Class 2 provides a connection-oriented class of service.

B.
The F_BSY frame is part of Class 2.

C.
Class 2 acknowledges frame delivery.

D.
BB_Credits do not exist in Class 2.

E.
Dedicated bandwidth is allocated when using Class 2.