單項選擇題

在CDMA硬切換流程中,需要進行異頻切換時,涉及到以下三條信令:
(1)Candidate Freg Search Response Message;
(2)Candidate Freg Search Request Message;
(3)Candidate Freg Search Report Message;
(4)Candidate Freg Search Control Message.
具體的時序順序為()

A.(1)(2)(3)(4)
B.(2)(1)(4)(3)
C.(4)(2)(1)(3)
D.(2)(4)(1)(3)


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