Groups of wires or multicords can be marked with _______ or _______?

The correct answer identifies the two effective methods for marking groups of wires or multicords, which are colored or white tape. These methods are widely used in electrical work to ensure clear identification and organization. Using colored tape helps distinguish between different circuits or functionalities, reducing the risk of confusion during installation or maintenance. White tape can serve as a neutral option when a color-coding system isn't necessary, yet still provides a method for marking and identifying wires.

Other options may suggest different marking techniques, but they might not be as practical or standard in professional settings. For example, using numbers or labels can be effective but usually requires a more formal system of categorization that might not be as immediately visible as colored tape. Similarly, markers or chalk are not commonly used for long-term identification because they can smudge or fade over time, compromising the visibility of critical information. Tags or strings might offer a temporary solution but lack the permanence and clarity necessary for electrical installations, where safety and easily traceable wiring are paramount.