What system of coding is utilized for temporary markings?

The International Color Code is the correct answer because it establishes a globally recognized standard for the use of colors in marking utilities, boundaries, and other temporary indications. This system assists in ensuring that workers can easily interpret the colors used for various types of infrastructure, thereby enhancing safety and reducing the potential for accidents. It provides clear visual guidance to individuals working around different utilities, making it particularly important in contexts such as excavation or maintenance where identifying underground lines or surfaces is crucial.

The other options, while related to marking, either do not specifically address temporary markings or lack the international standardization that the International Color Code provides. The National Marking Code may not encompass all colors used universally. The Standard Safety Code focuses more on general safety practices rather than specific marking codes, and the Local Marking Protocol can vary widely from one region to another, lacking the consistency needed for safe universal application.