(a) Felonies are classified according to the relative seriousness of the offense into five categories:
(1) capital felonies;
(2) felonies of the first degree;
(3) felonies of the second degree;
(4) felonies of the third degree; and
(5) state jail felonies.
(b) An offense designated a felony in this code without specification as to category is a state jail felony.