Which of the following statements of US Senate or Senator are true?
A.
The Senate has 100 members. Each of the 50 states elects two Senators.
B.
A senator must be over 20 years old, a resident in the state which they represent.
C.
The term for Senators is six years, but one third of them are elected every two years.
D.
A senator must have been an American citizen for at least nine years.