Option c: take cover, run, escape, don't look back, keep runnin'. All the way to guaranteed safety.
Concealed carry ought to be a complete surprise to a BG.
The right to defend oneself or others is akin to the right to vote.
Whether you excercise that right is still the exclusive domain of the individual.
In a lethal defensive mess, you still have the choice, if and only if you are armed.