Task: Question Answering
Input (English): Question: For every even positive integer m, f(m) represents the product of all even integers from 2 to m, inclusive. For example, f(12)=2x4x6x8x10x12. What is the greatest prime factor of f(28)?

 Option A: 2

 Option B: 7

 Option C: 11

 Option D: 13

 Option E: 17
Output (English): Option D