Which of the following statements about the sequence of a signal flow between the SDH interface and the cross-connect unit is correct?

Which of the following statements about the sequence of a signal flow between the SDH interface and the cross-connect unit is correct?

SPI<>RST<>MST<>MSP<>MSA<>HPT

SPI<>RST<>MSA<>MSP<>MST<>HPT

SPI<>MST<>RST<>MSA<>MSP<>HPT

SPT<>MST<>MSA<>RST<>MSP<>HPT

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Answer: A