The correct options are
A Each of the angles is a right angle.
B All the angles and sides are of equal length.
C The diagonals are of equal length.
D The diagonals bisect each other at right angles.
Properties of a square :
(i) All angles are equal .
(ii) All the sides are of equal length .
(iii) Each of the angle is a right angle .
(iv) The diagonals are of equal length .
(v) The Diagonals bisect each other at right angle