I understand that 3 notes can make up a triad, but (I know this is dumb) are they like this....eg


C-E-G
D-F-A
E-A-C
F-A-C
G-B-D
A-D-E
B-E-G

or are they

C-E-G
D-F#-A
E-Ab-B
F-A-C
G-B-D
A-Db-E
B-Eb-F#

I'm a little confused on what the triad is being based on. If I were to base it on the key of 'C', then, no #'s or b's would be present.