Mark the option which contains set of prime numbers.
2, 5, 9, 11, 17
19, 13, 11, 7, 3
A prime number is a number with only two factors,1 and the number itself.
1 is not a prime number, as it has only one factor.
2 is the only even prime number.
39 is not a prime number as it is also divisible by "3".