यदि सुरक्षा चिह्न का पृष्ठभाग (पृष्ठभूमि) नीले रंग का है, तो यह किस श्रेणी के संकेत को दर्शाता है?

Which of the following personal habits is considered an unsafe personal act rather than a direct structural cause of an occupational workplace hazard?

Standard warning safety signs feature a yellow background. What shape is used for warning signs?