2) Answer each of the following questions using an is* tests and/or relational and logical operators. Only one expression is allowed. a) Is the variable x real? b) Is the variable x empty? 693 5.3. Relational and Logical Operators in MATLAB c) Is the variable : an array (as opposed to a scalar)? d) Is the variable x false. This requires two test: first, is x a logical variable, and, second, is x false