Which of the following statements about multiplexed partial range error indication (MS-REI) is true① B2...

Which of the following statements about multiplexed partial range error indication (MS-REI) is true

① B2 byte represents the transmission channel.

② M1 byte folder indicates the transmission channel

③ MS-REI is sent from the receiver to the source.

④ MS-REI is transmitted from source to receiver

⑤ Indicates the number of bit errors detected by the receiver after receiving the MS signal.