Limit, Continuity and Differentiability: JEE Main 2004 Mathematics question

A function $y=f(x)$ has a second order derivative $f''\left( x \right) = 6\left( {x - 1} \right).$ If its graph passes through the point $(2, 1)$ and at that point the tangent to the graph is $y = 3x - 5$, then the function is :