Harry S. Truman, as vice president, was unaware of the atomic bomb. Now a vice president is a member of the National Security Council. What does this suggest about the vice president's role in the government? a. The role was more important in foreign affairs and is now focused domestically. b. The role was more powerful outside of the White House in persuading the American public. c. The role has fewer tasks to perform. d. The role has gained power and relevance in recent decades.