Compared with Traditional RAID Algorithms, the Erasure Code Redundancy Technology

Compared with traditional RAID algorithms, the Erasure Code redundancy technology provides higher reliability and more flexible redundancy policies. Which of the following statements about Erasure Code is incorrect?

A) Data to be written is divided into multiple data blocks of the same size.
B) The Erasure Code algorithm calculates N parity blocks for every M consecutive data blocks. (The value of N is smaller than that of M.)
C) M+N data blocks are concurrently stored to different nodes.
D) In Erasure Code storage mode, a concurrent failure of N-l disks is tolerated.