Which of the Following Statements Are True of Cardiac Output

Which of the following statements are true of cardiac output (Select all that apply) ?

A) Cardiac output equals stroke volume plus pulse.
B) Average resting cardiac output is approximately 5 liters per hour,and varies with the size of the person.
C) A certain level of cardiac output is necessary to maintain proper oxygenation of tissues.
D) Cardiac output may be decreased by severe hemorrhage.