Question: In a 5G New Radio (NR) system, as per the RRC protocol specification, what is the highest SubcarrierSpacing value (in kHz) that can be specified by the SubcarrierSpacing information element for frequencies or channels without any specific restrictions?
Option 1: 120 kHz
Option 2: 240 kHz
Option 3: 480 kHz
Option 4: 960 kHz
Explanation: According to the provided enumeration for SubcarrierSpacing within the RRC protocol, the highest value listed that does not have a version-specific restriction (indicated by "-v1700") is indeed 480 kHz. This suggests that for general applicability across various frequencies or channels without specific version restrictions, 480 kHz is the maximum SubcarrierSpacing value among the given options. Note that while 960 kHz is listed, it includes a version-specific marker ("-v1700"), implying its applicability might be restricted to certain versions or contexts, making 480 kHz the more universally applicable highest value in this context.