Which of the following statements are true? Select all that apply.

a) If f(x) is an non-zero constant, then ∫f(x)dx=0.
b) If f(x) is any constant, then ∫f(x)dx=f(x)+C.
c) If(x)=x² , then ∫f(x)dx= x3+C.
d) None of the above