3. A simple link is a 2-component link with the property that it admits a diagram that has exactly two crossings between the link components. (a) Give an example, with proof appealing to the definition given, of a simple link. (b) Give an example, again with proof, of a 2-component link that is not simple. (c) Consider a simple link & with the property that each component is a 3-colourable knot. Prove that the link L is 3-colourable