Regarding NB-IoT, which of the following descriptions are correct? (Multiple choice)
A . Need large bandwidth to meet demand
B . NB-IoT supports 3 different deployment modes, namely independent deployment, protection band deployment, and in-band deployment.
C . Longer DRX and paging cycles are required to save power
D . Currently, TDD LTE system does not support NB-IoT technology.
Answer: BCD