Answer: A. Distinct
Explanation: Distinct goods or services are those that generates economic benefit (that can be of use) to the customer on its own or together with other readily available resources (Goods or services that are sold separately or a resource that the customer already possess).
One of the measures of determining if a good or service is distinct is to determine if it can be sold on a standalone basis and if it can be separately identifiable from other promises in a contract.