Which of the following statement(s) given below is / are TRUE based on the figure given below:

A: ∠BAC + ∠ABC > ∠ACD

B: If ∠ACB > 80°, then ∠BAC + ∠ABC must be smaller than 100°.

C: If ∠ACD = 80°, then ∆ABC must be an acute angle triangle.