Regarding the switching mechanism of BWP, which of the following descriptions is wrong?

Regarding the switching mechanism of BWP, which of the following descriptions is wrong?
A . The uplink and downlink of the TDD system must be switched at the same time
B . The handover can be triggered by the base station or the terminal.
C . The uplink and downlink of the FDD system can be switched independently
D . Handover can only be triggered by the base station

Answer: D