Which of the following statements are true regarding electronegativity?

(a) Electronegativity generally increases across a period from left to right and decreases down a group in the periodic table.

(b) Electronegativity value decreases with the increase in atomic radii down a group.

(c) More a substance is electronegative more it will have non-metallic character. Hence, down a group metallic character of elements increases with decrease in electronegativity.

(d) In a period electronegativity increases with increased non-metallic characters.