Unified Modeling Language（UML） is a widely used method of visualizing and documenting an information system. The UML can be used to develop （1）， in which an object represents a person， place， event， or transaction that is significant to the information system. Systems analysts define an object’s attributes during the （2） . An object also has （3）， which are tasks or functions that the object performs when it receives a message，or command， to do so. A（n）（4） is a group of similar objects.If objects are similar to nouns， attributes are similar to adjectives that describe the characteristics of an object. Objects can have a specific attribute called a（n）（5）， which of an object is an adjective that describes the object’s current status. All objects within a class share common attributes and methods， so a class is like a blueprint， or template for all the objects within the class.

A

actor

B

instance

C

component

D

class

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答案：

D

题目描述了UML（统一建模语言）在信息系统开发中的应用，特别是关于对象模型的概念。其中提到的关键词“class”（类）与选项D对应，因为UML用于创建类，而类是包含具有共同属性和方法的对象的集合。因此，正确答案是D。