Pointer arithmetic in c and array bounds

Question

I was browsing through a webpage which had some c FAQ\'s, I found this statement made.

Similarly, if a has 10 elements and ip points to a[3],

Answer 1

The behaviour would be undefined in the following case

int a[3];
(a + 10) ; // this is UB too as you are computing &a[10]
*(a+10) = 10; // Ewwww!!!!