标识与安全标志

解析

Step 1: identify the sign family by shape and colour. A red circle with a slash is always a PROHIBITION, so the answer should look like '-(으)면 안 됩니다' or '-지 마십시오'. Step 2: look at the symbol — a flame, so using fire is forbidden: option 2. Option 1 describes an evacuation sign (green), option 3 an extinguisher-location sign (red with an extinguisher), and option 4 matches no standard sign. Remember: '화기 엄금' = open flames strictly forbidden.