The difference of Apple+option+R & Apple+R


17,1 imac 10.12.6 w fusion drive

tonite wanted reinstall sierra 10.12.6. chose hold apple+option+r, rebooted. installer window asked me continue install high sierra. stopped.

rebooted, holding apple+r, , asked install sierra. stopped ask forum question:

why asked install high sierra on fusion drive?
difference in 2 key combinations?

in past, thought either key combo allow me install latest system, imac. has changed?
 



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