In mammals, the teeth are.
I. only two sets, present throughout life.
II. embedded in the socket of the jaw bones.
III. different types.
These conditions are respectively referred as
(a) diphyodont, heterodont and thecodont
(b) diphyodont, thecodont and heterodont
(c) thecodont, diphyodont and heterodont
(d) thecodon, heterodont and diphyodont