Practical Geometry Symmetry & Visualising Solid Shapes

If we rotate a right-angled triangle of height 5 cm and base 3 cm
about its base, we get:
(a) cone of height 3 cm and base 3 cm
(b) cone of height 5 cm and base 5 cm
(c) cone of height 5 cm and base 3 cm
(d) cone of height 3 cm and base 5 cm