According to the concept of the production function, if a firm is inefficient, then it must mean
that,
O the firm is producing too many outputs.
O for a given input level, the output is less than the production function would have predicted.
O for a given input, the output is no more than what the production function would have predicted.
O for a given output, the input level is less than the production function would have predicted.
O the inputs are being overused.