A person's name, birthday, and identification number are all examples of:a.Attributesb.Descriptorsc.Relationshipsd.Entities

The correct answer is a. Attributes.

Step 1: Understand the terms

• Attributes: These are characteristics or properties that describe an entity. In the context of databases, an attribute may also be a column or field.
• Descriptors: These are words or phrases that describe or characterize something. In programming, a descriptor might refer to data about a program or a device.
• Relationships: These refer to how entities or things relate to each other. In databases, this could refer to how tables relate to each other.
• Entities: These are things or objects that are distinguishable from all other objects. In databases, an entity could be a table.

Step 2: Apply the terms to the examples

• A person's name, birthday, and identification number are characteristics or properties that describe a person. Therefore, they are attributes.

So, the answer is a. Attributes.