Characteristics of s-block elements are:
(A) They are prepared by the electrolysis of their fused salts.
(B) Their cations are diamagnetic.
(C) Elements have low density, good conductor of heat and electricity.
(D) Their oxides are basic in property.
(1) Only D
(2) A and B
(3) B and D
(4) A, B, C and D