Hedly gathered the following evidence. 5(22) = 110 5(33) = 165 5(44) = 220 Which conjecture might Hedly make from this evidence? Is the conjecture valid? Select one: a. When you multiply 11 by a multiple of 5, the first and last digits of the product will sum to the middle digit; this conjecture is valid.

b. When you multiply 11 by a multiple of 11, the first and last digits of the product will sum to the middle digit; this conjecture is valid.

c. When you multiply 5 by a multiple of 11, the first and last digits of the product will sum to the middle digit; this conjecture is valid.

d. When you multiply 5 by a multiple of 11, the first and last digits of the product will sum to the middle digit; this conjecture is not valid.