A design description of an object is known as a classOptionsinstanceobjectcaseboth instance and object

The correct term for a design description of an object in object-oriented programming is a class. A class serves as a blueprint or template from which individual objects (instances) are created.

Here's a brief breakdown of the terms:

1. Class: This defines the properties (attributes) and behaviors (methods) that the objects created from the class will have. It is a fundamental concept in object-oriented programming.

2. Object (or Instance): An object is a specific instance of a class. Each object can hold different values for its attributes defined by the class.

3. Case: This term does not specifically relate to object-oriented programming in the context described.

4. Both instance and object: Although these terms are often used interchangeably, they are not the correct answer in the context of defining a design description.

Therefore, the best answer to the question is class.