What do the following figures represent?

Options

A. A current in a circuit containing a source of constant emf., a pure resistance and a prue inductor after a long time, when the source is open at time t = 0
B. The number of undecayed nuclei in a large population of identical radioactive nuclei
C. The p.d. between the plates of charged capacitor, which is shorted by a pure resistance at time t=0
D. The temperature difference between a body and comparatively slightly cooler enclosure of constant temperature, in which the body is suspended.

Answer

B, C, D