To add to the "correct", I have noticed that a "yes" gets often chewed up by background noise or someone talking over, specially in teleconferencing. To me a "correct" gives a clearer acknowledgement.

My personal tick is "sure". A sure will nearly always prompt me to bark back a "does this mean a clear yes, or a 'sure I guess, if I have to, if there is nothing better'?" This drives me bonkers when we are talking about non-reversible decisions.