Describe the plane curve represented in polar coordinates (r , ) by the equation r = 4 sin( ) , [0 , ].
A) a straight line through the origin of slope 4
B) a circle centred at (x , y) = (2 , 0) and is of radius 2
C) a circle centred at (x , y) = (0 , 2) and is of radius 2
D) a circle centred at (x , y) = (0 , 2) and is of radius 4
E) a circle centred at (x , y) = (2 , 0) and is of radius 4
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