I'm pretty confident the answer is B - end of 2019. The NSA protocol was designed to bridge the gap until the full 5G standard was finalized, and that timeline fits with the information provided in the question.
Okay, I've got this. The NSA protocol was an early 5G specification that was meant to be a transitional phase before the standalone 5G architecture was ready. Based on the timeline, I'd say the end of 2018 is the most likely answer.
Hmm, I'm a bit confused by the terminology here. I'll need to review my notes on 5G protocols to see if I can figure out the right timeline for when the NSA protocol was frozen.
This one looks tricky, but I think I can narrow it down by the timeframe. The question mentions "non-standalone (NSA) protocol", so I'll focus on when that was likely to be finalized.
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