How many different sets of positive square integers M, each greater than 1, add up to 75?  Choose the correct choice from the following answers.
A) 1 B) 4 C) 7 D) 11 E) 13
13 = 13 is the correct answer.
<result>E</result>
How many different sets of positive square integers M, each greater than 1, add up to 75?