What accurately describes the flow control mechanism in an FC SAN?

What accurately describes the flow control mechanism in an FC SAN?
A . Both transmitting and receiving ports agree on the number of buffers available during port login
B. Negotiation occurs between an E_Port and an F_Port, and between two N_Ports
C. Credit value is incremented when a frame is transmitted and decremented upon receiving a response
D. Receiver Ready (R_RDY) is sent from the receiving port if available credits reach zero

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Answer: A