Which expression is equivalent to quantity y raised to the negative third power times z raised to the fifth power end quantity over quantity z raised to the negative fourth power times y raised to the sixth power end quantity all raised to the negative second power?

y raised to the eighteenth power over z raised to the eighteenth power
z raised to the eighteenth power over y raised to the eighteenth power
y raised to the ninth power over z raised to the ninth power
z raised to the ninth power over y raised to the ninth power