When you accept, people rarely read any response text that's included. In other words, time spent on option 1, "Edit the response before sending", would be better spent elsewhere.
When you select option 2, the meeting organizer just gets a default, generic "Nofel is attending" message. If any at all. Many people filter those messages or set up Outlook to not show them to them.
In both cases, the organizer will see your status for the meeting (attending, possibly attending, not attending) if they look at the meeting details; I'm not sure if they will if you select option 3.
If you're declining, it may be reasonable to include a polite message as to why; usually I'll respond if I already have time out of the office scheduled.
If you're selecting the "Tentative" option, it is reasonable to ask for more detail about the meeting, how critical your attendance is for it, etc. Just because you received a meeting invite does not obligate you to attend - in some offices, if you accepted every meeting invite you'd never be at your desk!