Following Euclid's proof that there are infinitely many primes, and starting the list with 5 and 7, you form the number 5*7+1=36, and you get the new prime numbers 2 and 3 because 36=2*2*3*3. Which new prime numbers would you get if your starting list were the following?
a. 2,3,5
b. 2,3,5,7
c. 3,5