Question: What is the nominal channel spacing for UE category NB1 and NB2 in stand-alone mode?
Option 1: 100 kHz
Option 2: 150 kHz
Option 3: 180 kHz
Option 4: 200 kHz
Explanation: The correct answer is 200 kHz, as specified for UE category NB1 and NB2 in stand-alone mode. This channel spacing is used to minimize interference between adjacent carriers and ensure efficient use of spectrum resources in wireless communication systems.