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(26)?	Answers:
A) 23
B) 19
C) 17
D) 13
E) 11
f(26) = 2*4*6*8*10*12*14*16*18*20*22*24*26   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(26)?