Which of the following descriptions of the BWP switching mechanism is wrong?

Which of the following descriptions of the BWP switching mechanism is wrong?
A . FDD system can switch between uplink and downlink independently
B . It can be the base station triggers the handover or the terminal triggers the handover
C . Handover can only be triggered by the base station
D . The uplink and downlink of the IDD system must be switched at the same time

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Answer: C