What is the sum of the greatest common factor and the lowest common multiple of 36 and 56? Choose the correct choice from the following choices.
A) 512  B) 508  C) 451  D) 516  E) 451

Rationale: "prime factorization of 36 = 2 x 2 x 3 x 3 prime factorization of 56 = 2 x 2 x 2 x 7 gcf = 4 lcm = 504 sum = 508 ans : b"
Answer: B