We want to design a prime-and-divisible circuit which detects if inputs are prime numbers, or if they are divisible by 4. Let your inputs I3:0 represent the inputs. Design a circuit that outputs a variable P which is TRUE if the input is a prime number, and outputs a variable D which is TRUE if the input is divisible by 4. Give K-Maps and simplified Boolean equations for each output, and sketch a circuit that implements them.

The answer is letter d. Talking to yourself. Communication involves exchanging information by any means just like smiling at someone gives an impression to a person that you are communicating with him/her. Talking to yourself is not a form of communication, since you are only communicating with yourself. E-mailing, Using Sign Language and Smiling are forms of communication because it deals with the exchange of information.