Final answer:
The suggested color scheme for making control zones is specified in NFPA 1521, important for identifying different zones at emergency incidents for safety and efficiency.
This correct answer is a)
Step-by-step explanation:
The color scheme suggested and encouraged in NFPA for making control zones is specified in NFPA 1521: Standard for Fire Department Safety Officer Professional Qualifications.
This standard outlines the suggested colors for identifying different control zones at emergency incidents, especially hazardous material (HAZMAT) situations.
These zones typically include the hot zone (exclusion zone), warm zone (contamination reduction zone), and cold zone (support zone), each recommended to be marked by specific colors for safety and efficiency during emergency operations.
This correct answer is a)