3. The group saying both at the same time. This was short lived and was very messy mainly seen in SegWit2x which had its own separate issues.
Slightly off-topic, but this group (as in anyone who support both off-chain and on-chain upgrade) is alive and well although most of them aren't in hurry for block size increase. And i wouldn't even categorize SegWit2x in this group when it was more about politic rather than technical issue.
if you actually read the block data of which flag bits in blockheaders reached which thresholds to trigger which events, you will see it was actually the NYA agreement that triggered segwit activation.. they just back tracked on the later promise of the 2x base limit.. becasue their actual agenda was just to get segwit activated using the blackmail of rejecting blocks that didnt display their flag bit in blockheader
if still unsure who to believe.. check the immutable blockchain data.. and which bits were associated with which proposal method of activation