A sentence has been given in Active/Passive voice. Out of the four alternatives suggested, select one

A sentence has been given in Active/Passive voice. Out of the four alternatives suggested, select one which best expresses the same sentence in passive/active Voice.

The police has caught the robbers red handed and they are taking them to the police station.

a)            The robbers have been caught red handed and are been taken to the police station.

b)            The robbers had been caught red handed and were being taken to the police station.

c)            The robbers had been caught red handed and were been taken to the police station.

d)            The robbers have been caught red handed and are being taken to the police station.