How did tribes gather royalties on coal mining? A. by requiring workers to pay for permits
B. by charging per bushel and ton of coal mined
C. by forcing mining companies to pay for leases
D. by processing and selling coal themselves

President of the united states has scheduled a cabinet meeting today to discuss energy policy with specific focus on pollution and global warming. given what you know of the executive branch, which group of attendees would the president most likely expect to provide up-to-date information and expert insight during this meeting?