What does the variable ser hold after the following se- quence of statements is executed, where N is an integer vari- able? boolean add; int k=1, d=1; int sum=0; int MEN; while (M>1) { add=false; k++; if (M%=-0) { add-true; M/-k; d=M%(k*k+1)*k; } else k++; if (add) sum+=d; M/=(k*k+1); k/=2; } A) Sum of all even digits of N. B) Sum of the squares of all digits of N. C) Sum of all positive divisors of N D) Sum of all prime divisors of N. E) Sum of the squares all prime divisors of N