What is the difference in the short run and the long​ run? in the short​ run,
a. at least one of the​ firm's inputs is​ fixed, while in the long​ run, the firm is either able to vary all its​ inputs, adopt new​ technology, or change the size of its physical plant.
b. at least one of the​ firm's inputs is​ fixed, while in the long​ run, at least one of the​ firm's inputs is variable.
c. all of the​ firm's inputs are​ fixed, while in the long​ run, the firm is able to vary all its​ inputs, adopt new​ technology, and change the size of its physical plant.
d. at least one of the​ firm's inputs is​ fixed, while in the long​ run, the firm is able to vary all its​ inputs, adopt new​ technology, and change the size of its physical plant.
e. all of the​ firm's inputs are​ variable, while in the long​ run, the firm is able to vary all its inputs as well as adopt new technology and change the size of its physical plant?