(d) +, +
For a convex mirror, the principal focus lies behind the mirror (to the right of pole), so focal length $f$ = positive. When object is at infinity, image forms at focus F, also behind the mirror, so image distance $v$ = positive.
Key points: Under New Cartesian Sign Convention, distances measured to the right of the pole are positive. A convex mirror's focus is behind the mirror (right side) → $f$ = +. Object at infinity gives image at F (behind mirror) → $v$ = +. This is directly supported by Example 9.1 where $f = +1.50$ m and $v = +1.15$ m for a convex mirror, and Table 9.2 which states the image forms "at focus F, behind the mirror" when object is at infinity.