Receipts received in the ordinary course of business are considered to be ordinary income and consequently taxable. Which of the following statements is incorrect?

a$.$A scaffolding company that hires out equipment, but has receipts from customers for lost scaffolding, must include, in ordinary income, this incidental income.

b$.$The purpose for which an asset is acquired is not important when determining if its sale is ordinary income.

c$.$A taxpayer who disposes of land bought previously but not used for productive purposes, eg for mining due to a lack of funds, will not be subject to income tax on the proceeds of the sale as no mining took place.

d$.$If a taxpayer who runs a retail business, but makes some profits from a financial transaction, which has nothing to do with retailing, then this will not be considered to be taxable income.