Regarding the reselection from 4G to 5G, which of the following descriptions is correct?

Regarding the reselection from 4G to 5G, which of the following descriptions is correct?
A . After reselecting to 5G, the terminal will initiate the TAU process
B . There will be signaling interaction between EPC and 5GC during the reselection process.
C . The usual scenario is reselection from high priority to low priority
D . Normally, the UE will always measure the 5G level in the 4G idle state.

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Answer: D