Sport Mode(s), DS, M...???

[BloodRedHog]

I did a search and it's still a bit vague....

When driving, I can do one of the following...

1) regular auto (display "D")
2) manual shift (display "M1, etc")
3) regular auto sport mode (press sport, display "DS and sport")
4) manual shift sport mode (press sport, display "M1 and sport"?)

So in which modes are throttle and steering responses increased?

What is the difference between #2 and #4?
Does pressing sport enhance throttle and steering or is it sliding the shifter to the left?

Thanks for any input