Responding to Your HBS Admissions Decision

Today is one of those days on the calendar that tend to stop everyone in their tracks and dominate the headlines.  Nevermind that the Kellogg Round 1 deadline is tomorrow or that some people found out today that they were admitted to MIT - no, it's all about the HBS Round 1 notification deadline.  Interview or ding?  Rather, interview or ding or deferral, as that appears to be a popular option this year as well.  Let's make sense of things and offer some advice on how to respond from here.  We'll group it result-by-result.