Which equation can you use to evaluate $\log _{\frac{1}{3}} 27$ ?
A$\left(\frac{1}{3}\right)^z=27$
B$\frac{1}{3} z=27$
C$z^{\frac{1}{3}}=27$
A$\left(\frac{1}{3}\right)^z=27$
B$\frac{1}{3} z=27$
C$z^{\frac{1}{3}}=27$