The Following Equations Represent a Curve or a Surface $\rho$ $\varphi$

The following equations represent a curve or a surface.Select the best geometric description. (Note: $\rho$ , $\varphi$ , $\theta$ are spherical coordinates; r, $\theta$ , z are cylindrical coordinates.)

A) Part of a line through the origin
B) Disk
C) Part of a cylinder.
D) Part of a cone.