Which of the followingis the correct continuity equation:

A

$$ \triangledown ● J = \frac{\partial \rho}{\partial t}$$

B

$$ \triangledown ● J = - \frac{\partial \rho}{\partial t}$$

C

$$ \triangledown ● J = 0$$

D

$$ \triangledown ● J = - \frac{\partial E}{\partial t}$$