If $A$ denotes the sum of all the coefficients in the expansion of $(1-3x+10x^2)^n$ and $B$ denotes the sum of all the coefficients in the expansion of $(1+x^2)^n$,then:
- A$A=B^3$
- B$3A=B$
- C$B=A^3$
- D$A=3B$
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