Can someone please check me answers?

1. Simplify the expression.
(n^4)^8
a) n^48
b) n^32 << My answer
c) n^12
d) n^4

2. Simplify the expression.
(c^3)^5(d^3)^0
a) c^15d^3
b) c^15 << My answer
c) c^8d^3
d) 0

3. Simplify the expression.
(m^3)^-1(x^2)^5
a) x^7/ m^4
b) x^20/ m^-4
c) x^7/ m^2
d) x^10/ m^3 << My answer