Which design pattern ensures that only one object of particular class gets created?

A. A reusable software component that follows specific conventions B. A type of coffee bean C. A Java class used for file I/O D. A Java keyword

A. `.bean` B. `.jar` C. `.class` D. `.java`

A. To set the value of a property B. To create a new instance of a bean C. To retrieve the value of a property D. To execute a SQL query

A. It represents a JavaBean interface B. It allows you to examine the properties, events, and methods of a bean C. It handles database connections D. None of These