Which of the following statements are true for "Argumentation" in mathematics classroom?

(A) It can be understood as a line of reasoning that intends to show or explain why a mathematical result is true

(B) A mathematical argument might be a formal or informal proof

(C) It can also be a part of the Heuristic approach in mathematics education

(D) It cannot be used for teaching mathematics as argumentation is important only for
social science

Choose the correct option.