Identify the Geometric Object That Is Represented by Parametric Equations $\mathbf { r } ( t ) = \langle 3 \cos t , 3 \sin t , t \rangle$

Multiple Choice

Identify the geometric object that is represented by parametric equations $\mathbf { r } ( t ) = \langle 3 \cos t , 3 \sin t , t \rangle$ .

A) A plane
B) A cone
C) A straight line
D) A circular cylinder
E) A circle
F) A circular disk
G) A helix
H) A sphere