Using the Zero Exponent Rule

Simplify each expression using the zero exponent rule of exponents.

1. ⓐ $\frac{c^{3}}{c^{3}}$
2. ⓑ $\frac{−3 x^{5}}{x^{5}}$
3. ⓒ $\frac{\left(j^{2} k\right)^{4}}{\left(j^{2} k\right) \cdot \left(j^{2} k\right)^{3}}$
4. ⓓ $\frac{5 \left(r s^{2}\right)^{2}}{\left(r s^{2}\right)^{2}}$