Which of the following is considered a loop with a bound that could be problematic?

$$

for $($int i $=1$; i $!=$ n; i$++)$

for $($int i $=1$; i $<=10$; i$++)$

for $($int years $=$ n; years $<0$; years$--)$

for $($int i $=1$; i $<=$ n; i$++)$