Which of the following is a multiple of 5, \forall n\in N?
A. \quad n^6-n^2+10
B. \quad n^{15}-n^{13}+25
C. \quad n^5-n-25
D. \quad n^{13}-n^{15}+35
E. None
A or C?
A. \quad n^6-n^2+10
B. \quad n^{15}-n^{13}+25
C. \quad n^5-n-25
D. \quad n^{13}-n^{15}+35
E. None
A or C?
