Correct Answer  Option 4 : π/30 rad/s
CONCEPT:

Angular velocity (ω): It is defined as the rate of change of angular displacement (θ).
∴ω = θ / t
Hence, a unit of angular velocity in rad/sec or degree/sec
CALCULATION:
Given that:
Secondhand clock:
Time taken to complete 1 revolution, t = 60 sec
Angle rotated (θ) = 2π rad
Angular speed (ω) of a second hand is given by:
\(\left( {{ω }_{s}} \right)=\frac{2π }{60}= \frac{\pi }{30} \) rad/s
So option 4 is correct.