For a positive constant $c,$ in cylindrical coordinates $(r,\theta,z),$ find the shape described by the equation
\[r = c.\](A) Line
(B) Circle
(C) Plane
(D) Sphere
(E) Cylinder
(F) Cone

Enter the letter of the correct option.
Question:
For a positive constant $c,$ in cylindrical coordinates $(r,\theta,z),$ find the shape described by the equation
\[r = c.\](A) Line
(B) Circle
(C) Plane
(D) Sphere
(E) Cylinder
(F) Cone

Enter the letter of the correct option.
Answer:
Let's think step by step.

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\text{(E)}
For a positive constant $c,$ in cylindrical coordinates $(r,\theta,z),$ find the shape described by the equation
\[r = c.\](A) Line
(B) Circle
(C) Plane
(D) Sphere
(E) Cylinder
(F) Cone

Enter the letter of the correct option.
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