Final answer:
Commission-based is the most popular sales force payment method, where salespeople are compensated based on the percentage of sales they generate.
Step-by-step explanation:
The most popular sales force payment method is option 2: Commission-based. In a commission-based payment system, salespeople are compensated based on the percentage of sales they generate. This incentivizes them to work harder and generate more revenue for the company.
For example, if a salesperson earns a 10% commission on each sale and sells a product worth $1000, they would earn $100 as their commission. This payment method is commonly used in industries such as real estate, insurance, and retail.