question_answer

x, y, z, w are four odd natural numbers. Let\[u=\]\[{{x}^{2}}+{{y}^{2}}+{{z}^{2}}+{{w}^{2}}\]. Consider following statements

I. U is always divisible by 4

II. U is never divisible by 8

Which of the above statements) is /are true?

A)  Only I                         

B)  Only II

C)  Both I and II                

D)  neither I nor II