Which statement best describes the zero exponent rule and the special case for $0^0$?

For any base $b$, including zero, $b^0$ equals $0$ because raising any number to the zero power removes all factors and leaves nothing.

When exponents subtract to zero, the result is generally indeterminate. You should expand the expression and count the remaining factors each time. However, $0^0$ is sometimes defined as $1$ by convention.

If the exponents subtract to give zero, then the expression equals zero, and $0^0$ equals $1$ according to the rules of exponent arithmetic.

For any nonzero base $b$, $b^0$ equals $1$. However, $0^0$ is considered undefined because of the different ways of thinking about exponents. Such as repeated multiplication versus raising zero to a positive power which will give conflicting results, and it can lead to the indeterminate form $\frac{0}{0}$.