单项选择题

The following events all require an SDCCH. Which event has normally the longest holding time? （）

A. Normal updating
B. IQMSI attach/detach
C. Registration
D. Call set-up
E. SMS point-to-point

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网络维护生产岗位(优化专业)

The following events all require an SDCCH. Which event has normally the longest holding time? （）