For an ideal free radical polymerisation without chain transfer at fixed temperature and monomer concentration, the initiator concentration is increased. Take the rate to vary as $[\mathrm{I}{]}^{1/2}$ and the kinetic chain length as $[\mathrm{I}{]}^{-1/2}$. Which of the following is/are correct? (One or more options may be correct.)

1. AThe average degree of polymerisation decreases.
2. BThe rate of polymerisation increases.
3. CThe rate of polymerisation is unaffected.
4. DThe average degree of polymerisation increases.