Design a logic circuit for a manufacturing plant exit time horn and emergency horn using decoders and external OR gates. The exit time horn should be activated when either of the following conditions is met: 1.It is after 5 o 'clock, and all machines are shut down. 2. Its Friday, the production run for the day is complete, and all machincs arc shut down. 3. The machines are running using generator for more than 6 hours. The emergency horn should be activated when either of the following conditions is met: 1. It is before 5 o clock and all machines are shutdown. 2. The production run for the day is incomplete and all machines arc shutdown.