What did I learn from solving the above problem of production cost minimization?

Group of answer choices

I don't know what I learned.

I learned microeconomic theory shows there is no way firms can minimize their cost of producing output.

I learned microeconomic theory shows that we can find the cost minimizing bundle of inputs, labor and capital, if we are given the input prices but we do not need to have any information about production function.

I learned that if we are given the information about the production function, a specific output target, and input prices, microeconomic economic theory provides a guiding rule to find the optimal combination of labor and capital that will allow a firm to meet an output target at minimum cost to the firm.