Which of the following statements is true about the LTE protocol architecture? (Multiple choice)

Which of the following statements is true about the LTE protocol architecture? (Multiple choice)
A . The role of the transport channel is to describe how information is transmitted over the wireless interface.
B . The physical layer provides data transmission services to the upper layers, which can be accessed through the MAC sublayer and using the transport channel.
C . The role of the logical channel is to characterize the type of message being transmitted.
D . MAC provides different logical channels to Layer 2 Radio Link Control (RLC) sublayer

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Answer: ABCD