Imani and Todd were trying to solve the equation: x²−6x−5=8. Imani said, "I can factor the left-hand side into (x−1)(x−5), so I'll solve using the zero product property." Todd said, "I can solve by completing the square. If I add 4 to each side, I can rewrite the equation as (x−3)²=12." Whose solution strategy would work?

a. Imani's strategy
b. Todd's strategy
c. Both strategies are valid
d. Neither strategy is valid