Answer
Focus is: $(1,0)$ and directrix is: $x=-1$; $\bf{Graph (c)}$
Work Step by Step
Standard form of a parabola is given as: $y^2=4px$ ...(1)
Formula to find focus is: $F(p,0)$ and formula to find directrix is: $x=-p$
As we are given that $y^2=4x$
Compare this form with the equation (1), we have: $p=1$
Thus, Focus is: $(1,0)$ and directrix is: $x=-1$
All the above information matches to the $\bf{Graph (c)}$.
