A handoff may be occurs when ______. (1) a mobile stationchanges its association from one base station to another during acall (2) people shut down his (her) cellphone. (3) the signalbetween the current base station and the mobile may havedeteriorated to such an extent that the call is in danger of beingdropped (4) a cell may have become overloaded, handling a largenumber of calls.
A. (1)(2)(3)
B. (1)(2)(3)(4)
C. (1)(2)(4)
D. (1)(3)(4)
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