1. Choose the expression below that can be simplified using the product rule.
(4⁵ a⁰)(7²b⁻⁶)
(8⁵a⁻⁴)(b⁷c⁻⁵)
a⁻⁷b¹⁰ / c⁷ d¹⁴ . 15
(11²a⁻⁵)(11a⁹b⁷) / 5²