Which statement is a correct description of the difference between these two numbers?

\large 4.23\times10^{-5} and \large 4.23\times10^5

a
One of the numbers in standard form is large (>1) and the other number in standard form is small (<1).
b
Both numbers are the same. There are no differences.
c
One of the numbers in standard form has 5 zeros, while the other number in standard form has 3 zeros.
d
One of the numbers in standard form is positive and the other number in standard form is negative.