The foot of perpendicular from the origin \( O \) to a plane \( P \) which meets the co-ordinate axes at the points \( A, B, C \) is \( (2,a,4) \), \( a\in \mathbb{N} \). If the volume of the tetrahedron \( OABC \) is \( 144 \,\text{unit}^{3} \), then which of the following points is NOT on \( P \)?
