What was the importance of the case Smith v Anderson regarding the 'carrying on of a business'?

What was the importance of the case Smith v Anderson regarding the 'carrying on of a business'? Choose the most appropriate response.

a. The case concerned a party who contributed to a trust along with the other contributors, which in essence made him a partner with all other contributories

b. Smith v Anderson is now enshrined in law, and a single transaction can now never be considered to be a carrying on of a business

c. Under the partnership legislation, any trade, occupation or profession can be a business. Therefore, even one transaction means that there is a business and the parties with one transaction are 'carrying on a business'

d. The case was important because it sets a principle that 'repetition of acts' indicate a carrying on of a business, as distinct from one single act, which does not (usually) represent a carrying on of a business