Question: What are the cell reselection scenarios supported in NR?
Option 1: Only cell reselection between NR RRC_CONNECTED and E-UTRA RRC_CONNECTED.
Option 2: Cell reselection from NR RRC_INACTIVE to E-UTRA RRC_IDLE, but not between NR RRC_IDLE and E-UTRA RRC_IDLE.
Option 3: Both cell reselection between NR RRC_IDLE and E-UTRA RRC_IDLE, and cell reselection from NR RRC_INACTIVE to E-UTRA RRC_IDLE.
Option 4: Only cell reselection from NR RRC_CONNECTED to E-UTRA RRC_IDLE.
Explanation: The correct answer is Option 3 because both scenarios are explicitly mentioned as supported in the provided text. Cell reselection between NR RRC_IDLE and E-UTRA RRC_IDLE allows for seamless transition between idle states of different radio access technologies, while cell reselection from NR RRC_INACTIVE to E-UTRA RRC_IDLE enables the UE to move from an inactive state in NR to an idle state in E-UTRA.