NEED ASAP PLEASEE

Explain why the number 8,000 is a perfect cube.
The number 8,000 is a perfect cube because it is the square of the number 20.
The number 8,000 is a perfect cube because its cube root is an integer.
The number 8,000 is a perfect cube because it is the square root of 64,000,000.
The number 8,000 is a perfect cube because its square root is an integer.