B has a smaller first ionization enthalpy than Be. Consider the following statements :

I) it is easier to remove 2p electron than 2s electron

II)  2p electron of B is more shielded from the nucleus by the inner core of electrons than the 2s electrons of Be

III) 2s electron has more penetration power than 2p electron

IV) atomic radius of B is more than Be

(atomic number$B=5,Be=4$ )

The correct statements are :