:)

richard simplified an expression in three steps, as shown:

which is the first incorrect step and why?

options below : )

a) step 1, all the exponents are multiplied by 3
b) step 2, the exponents in the denominator are multiplied
c) step 3, the exponents of the same base are subtracted during division
d) step 3, the exponents of the same base are added during division