Concept: Prime Number: Prime numbers are numbers greater than 1. They only have two factors 1 and the number itself. Composite number: Composite numbers can be defined as numbers that have more than two factors. Odd number: Odd numbers have the digits 1, 3, 5, 7 or 9 in their ones place. Even Number: Whole numbers that have the digits 0, 2, 4, 6 or 8 in their ones place are even numbers. Calculation: (a) Prime number can be even number or odd number. (b) Except 2, all even numbers are composite numbers. (c) The sum of two prime numbers can be even number or odd number. (d) If an even number is divided by 2, the quotient is always zero. The correct option is 3 i.e All (a), (b), (c) and (d)