ROC Random $-$ If we use a random guesser as a binary classifier, what will be the shape of the ROC curve?

A horizontal straight line from $(0,0\mathrm{.}5)$

A vertical straight line from $(0\mathrm{.}5,0)$

A vertical straight line passing through origin

A straight line of slope $1,$ passing through the origin

A straight line of slope $1,$ from $(0,0\mathrm{.}5)$

A straight line of slope $1,$ from $(0\mathrm{.}5,0)$