Final answer:
Monthly salaries are not classified as OpEx, they are considered part of the cost of goods sold (COGS) or labor costs in a business.
Step-by-step explanation:
The statement that monthly salaries are OpEx is FALSE. OpEx, or operating expenses, refer to the ongoing costs of running a business, such as rent, utilities, and salaries. However, salaries are not classified as operating expenses; they are considered part of the cost of goods sold (COGS) or labor costs.