3. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z (a) Which uppercase letters have two lines of symmetry? (b) Which letters have two rotational symmetries but no lines of symmetry? (c) Which letters will not appear reversed when they are held in front of a mirror? (d) Use some of the letters from part c to find three words whose reflection in a mirror is also a word.