Which ofthe graphs below might represent periodicfunctions? You should list only those functions for which more than one full period is shown. (I) (II) y (m) y 8 l r . x x x 1284 0 4 8 12 42-840 4 8 12 12-840 4 8 12 (N) 3' (v) 3' (VI) y 8 . l l 3 X x x 1284 0 4 8 12 1284 0 4 8 12 1284 0 4 8 12 (I) (II) (III) (IV) (V) (VI) llllll