Consider following statements:
$I.$ Cationic polymerization occurs in monomers with electron donation substitutents.
$II.$ Anionic polymerization occurs in monomers with electron-withdrawing substitutents.
$III.$ Head-to-head chain growth polymerisation occurs in polystyrene.
Select correct statements:

$(\mathrm{I})$ Cationic polymerization of olefin monomers occurs with olefins that contain electron-donating substituents. These electron-donating groups make the olefin nucleophilic enough to attack electrophilic initiators or growing polymer chains. This is correct.
$(\mathrm{II})$ Typical monomers for anionic polymerization generally contain substituents that are electron withdrawing and/or can stabilize the negative charge through delocalization. These monomers include styrene, dienes, methacrylate, vinyl pyridine, and lactones. This is correct.
Vinyl derivatives containing electron releasing group readily undergo head to tail addition polymerization. Thus, $(\mathrm{III})$ is incorrect.