answer
infield fly rule applies. the batter is out. the ball is live. there is no force at any base. the runners may advance and are in jeopardy with the same rules as any ordinary fly ball. ruling: three outs (infield fly rule, batter is out. runners from first and second are out because they are in jeopardy after a caught fly ball.) run counts because the runner tagged up and tagged home plate before the third out.