When constructing a principal ray diagram for an object placed between $F$ and $C$ of a concave mirror, which pair of rays is generally sufficient and convenient to locate the image?

Any two rays drawn from the base of the object instead of the tip

The $P$-ray and a ray parallel after reflection from the vertex only

Only the $C$-ray, because it uniquely determines image size

The $P$-ray and the $F$-ray