which selection to make during mic setup? Options

[speaker-independ...]

I have DNS 7.3 and need to know which option to select during new user setup. I want to use the built-in mic(s) in my Toshiba Portege 3505 tablet pc, but I can't find any info. on what kind of mic(s) those are, in terms of the options presented in the DNS new user setup list. Anyone know? Is the internal mic actually array micS? Or is the internal mic considered to be a USB mic? or what? THANKS!!!