In the long run __________.

Option 1 -> This could apply to both short run and long run, not specific to long run.

Option 2 -> In the long run, all factors of production (land, labor, capital, entrepreneur) can be varied and adjusted according to production needs.

Option 3 -> This describes the short run where at least one factor remains fixed, not the long run.

Option 4 -> This is characteristic of the short run where typically only variable factors can change while fixed factors remain constant.

Hence, Option 2: All factors of production can be varied -> In economics, the long run is defined as a period of time in which all factors of production and costs are variable. Unlike the short run where at least one factor (usually capital like plant, machinery, or building) is fixed, the long run allows firms complete flexibility to adjust all inputs including plant size, equipment, labor force, and raw materials. This enables firms to achieve optimal production scale and make strategic decisions about expansion or contraction of operations -> correct