Classifications and types of weapons of mass destruction (WMDs)

There are five classifications and types of weapons of mass destruction (WMDs) to include chemical, biological, radiological, nuclear, and explosive (CBRNE). Outline one type of weapon of mass destruction that falls into each classification (i.e., nuclear-atomic bomb), and explain why this WMD is considered a weapon. Which classification (CBRNE) poses the biggest threat to the United States and global community today? Why?