Which statement is true? Variables cannot be assigned and declared in the same statement. Variable names must contain at least one dollar sign. When declaring a variable, you also specify the type of its values. Variable names can be no more than 8 characters long. Which one of the following is a correct representation of the given mathematical expression in Java? N (b / 2) / 2 a b / 2 (a - b / 2 / 2 a - b / 2 % 2