Let \( f:\mathbb{R}\to \mathbb{R} \) be a function defined by \( f(x)=(x-3)^{n_1}(x-5)^{n_2}, \, n_1,n_2 \in \mathbb{N} \). Then, which of the following is NOT true?
For \( n_1 = 3, n_2 = 4 \), there exists \( \alpha \in (3,5) \) where \( f \) attains local maxima
For \( n_1 = 4, n_2 = 3 \), there exist \( \alpha \in (3,5) \) where \( f \) attains local minima
For \( n_1 = 3, n_2 = 5 \), there exists \( \alpha \in (3,5) \) where \( f \) attains local maxima
For \( n_1 = 4, n_2 = 6 \), there exists \( \alpha \in (3,5) \) where \( f \) attains local maxima