Which statement accurately compares ionic and covalent bonding?

Conduct electricity when they are molten, while covalent compounds usually do not conduct electricity when they are molten.

Ionic have high melting and boiling points while covalent has low melting and boiling points.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.