Read the following are the statements regarding polarising power of IIA group cations

i) Be mostly forms covalent compounds due to high polarising power of ${\text{Be}}^{+\text{2}}$  ions

ii) Be always form covalent compounds due to low polarising power of ${\text{Be}}^{+\text{2}}$  ions

iii) Polarising power of IIA cations decreases from ${\text{Be}}^{+\text{2}}$  ion to ${\text{Ba}}^{+\text{2}}$ ion

The correct combination is