UPSR protection switching is initiated by （）, while BLSR is initiated by （）.A、the K1 SONET byte； the K2 SONET byteB、the K2 SONET byte；the K1 SONET byteC、transmitter switching；receiver detectionD、Line Overhead bytes；Path Overhead bytesE、Path Overhead bytes；Line Overhead bytes
UPSR protection switching is initiated by （）, while BLSR is initiated by （）.
- A、the K1 SONET byte； the K2 SONET byte
- B、the K2 SONET byte；the K1 SONET byte
- C、transmitter switching；receiver detection
- D、Line Overhead bytes；Path Overhead bytes
- E、Path Overhead bytes；Line Overhead bytes
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