For stable equilibrium, which of the following is/are true ?

Options

A. `(dU)/(dx)=0` and `(d^(2)U)/(dx^(2)) gt 0`
B. `(dU)/(dx)=0` only
C. `(dU)/(dx)=0` and `(d^(2)U)/(dx^(2)) lt 0`
D. None of these

Answer

C