Let $y^2-4ax+4a=0$ and $x^2+y^2-2(1+a)x+1+2a-3a^2=0$ be two curves. State which one of the following statements is true.
- These two curves intersect at two points
- These two curves are tangent to each other
- These two curves intersect orthogonally at one point
- These two curves do not intersect