Which of the following correctly describes a production isoquant?
An isoquant is a curve that shows the least-cost combinations of inputs that can produce a given level of output.
An isoquant is a curve that shows all possible levels of output that can be produced at various input price levels.
An isoquant is a curve that shows all possible combinations of inputs that can produce a given level of output.
An isoquant is a curve that shows all possible combinations of inputs that are used to produce various levels of output.
An isoquant is a curve that shows all possible levels of output that can be produced in the short-run using one variable input.