The Question Mark (?)After an Element in a DTD Means

question 62

Multiple Choice

The question mark (?) after an element in a DTD means that:

• A)there are many occurrences of that item.
• B)there could be any number of occurrences of that item.
• C)that item can appear at most once.
• D)All of the above

---

Definitions:

Marginal Cost

The growth in the cumulative expense incurred from creating one more unit of a product or service.

Nonrival

A characteristic of a good or service where its use by one person does not reduce its availability to others.

Consumption

The use of goods and services by households or individuals, constituting one of the primary components of economic activity.

Demand-side Market Failure

A situation where the quantity of a product demanded by consumers does not equate to the quantity supplied by producers due to externalities or imperfect information, leading to an inefficient allocation of resources.