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(30)?  Choose the correct choice:
A) 2  B) 5  C) 11  D) 13  E) 19
f(30) = 2*4*6*8*10*12*14*16*18*20*22*24*26*28*30   The greatest prime factor in this list is 13.   The answer is 13.
<result>D</result>
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(30)?