Angle θ is positioned in a circle with its initial ray on the positive x-axis and its terminal ray 1/3 of one complete revolution about the origin, as shown in the following diagram. What is the measure of angle θ, in degrees and in radians? Select one answer.
A
60and π/3 radians
B
60 and 2π/3 radians
C
120 and π/3 radians
D
120 and 2π/3 radians