Option 1 -> This correctly defines Average Product (AP = Total Product / Labor).
Option 2 -> This describes Marginal Product, not Average Product (MP = ΔTP/ΔL).
Option 3 -> This is an incorrect formula that doesn't represent any standard productivity measure.
Option 4 -> This is an incorrect formula that doesn't represent any standard productivity measure.
Hence, Option 1: By dividing the total product by the number of labor -> Average Product (AP) measures the output per unit of labor input. It is calculated as AP = Total Product (TP) / Labor (L). For example, if 10 workers produce 100 units, the average product is 100/10 = 10 units per worker. This helps firms understand the typical productivity level of their workforce in the short-run when some factors of production are fixed -> correct