It depends on the audience you are addressing

[Bobbert]

I’m unsure how to say:
It depends on the audience you are addressing.

The first thing that comes to my mind is:
Depende del público al que te dirijas.

But then I question if it should be:
Depende del público a que te dirijas.

And now I’m questioning whether it should be said in the indicative:
Depende del público al que te dirijes.
Depende del público a que te dirijes.

Which is most correct.

Do I need “a que” or “al que”? and why?

Is the indicative or subjunctive needed? and why?

Input with explanations is very much appreciated.

[Rusty]

Giving your opinion about something over which you have no control is subjective, which calls for the subjunctive.
The article is used to refer back to the object.