निम्नलिखित में से कौन सा वायरिंग सिस्टम विशेष रूप से अस्थायी स्थापनाओं (temporary installations) के लिए उपयुक्त है और उपयोग किया जाता है?

Which system of internal wiring operates such that illuminating one light automatically switches off the previous light as a person advances through rooms?

A diagram that shows the actual physical connections and layout of components like lamp-holders, lamps, and two-way switches in an electrical circuit is called a _____.