the one to

[navi tasan]

1-I am the one to complain, not you.

Does this mean:
a- I am the one who has the right to complain
b- I am the one who always complains
c- I am the one who has been given the task to complain (probably go see somebody and complain about something like work conditions)

[Tdol]

a or c IMO, though b might be possible in the right context.